Achieving BCNF helps in minimizing data redundancy and anomalies, thus improving data integrity. It ensures that every determinant is a candidate key, enhancing data integrity. BCNF may simplify data retrieval but does not directly impact query performance. 

Range partitioning in DB2 involves distributing data based on a specified range of values for a particular column. Hash partitioning, on the other hand, distributes data based on hash values of specified columns, ensuring even distribution across partitions. Range partitioning is typically used when data can be logically grouped into ranges, while hash partitioning is suitable for distributing data uniformly across partitions. 

Joins in DB2 are used to combine rows from two or more tables based on a related column between them. This allows for retrieving related data from different tables. 

Access Control Lists (ACLs) in DB2 security enable administrators to define specific criteria for granting or denying access to database objects based on user-defined conditions, ensuring precise control over who can access what. 

The MODIFIED BY NOHEADERS option should be used to exclude the header row during the import process. This option instructs the IMPORT utility not to treat the first row of the input file as column data, effectively skipping it during the import operation. This ensures that only the actual data from the CSV file is imported into the DB2 table, without including the header row. 

Troubleshooting in DB2 involves identifying and resolving issues that affect database performance or functionality. This process includes diagnosing problems, analyzing logs, and applying appropriate fixes or configurations to address the root cause of the issue. 

Materialized views in DB2 can significantly enhance query performance in scenarios requiring frequent querying of aggregated data from multiple tables. By storing precomputed results, materialized views eliminate the need for repeated computation of aggregates, thereby reducing query processing time. This approach also minimizes resource utilization and enhances overall system efficiency. Materialized views can be periodically refreshed to ensure that the data remains up-to-date, providing users with accurate insights without the overhead of recalculating aggregates on the fly. 

Denormalization involves introducing redundancy into a table or database to improve query performance or simplify data management. Common techniques include data duplication, where selected data is stored in multiple tables for easier retrieval, and aggregating tables, where data from multiple tables is combined into a single table for faster queries. 

Implementing compression is an effective strategy to address the issue of large backup sizes when using the EXPORT utility. By enabling compression during the export process, the company can significantly reduce the size of the backup files, thereby saving storage space and improving overall performance. Compression techniques such as zlib or gzip can be applied to the exported data to achieve compression ratios that balance between space savings and processing overhead. 

The correct option is "Count". The COUNT() function in DB2 returns the number of rows that meet the specified condition. It is commonly used to count the number of rows in a table that satisfy certain criteria.