The correct option is 'DELETE'. This SQL command is used to remove one or more rows from a table based on the condition specified in the WHERE clause. It allows the DBA to selectively remove outdated records while retaining the structure of the table and other existing data. 

DB2 integrates with cloud platforms like AWS and Azure by leveraging managed database services provided by these platforms. These services offer features such as automated backups, scaling, and high availability, making it easier to deploy and manage DB2 databases in the cloud. 

In the event of a critical failure, implementing a high availability solution with automatic failover to a standby server is crucial to minimize downtime and data loss. This involves configuring DB2 for automatic client reroute and using tools like HADR (High Availability Disaster Recovery) to ensure seamless failover to the standby server. This approach ensures that database operations can continue with minimal interruption. 

The correct option is 'INSERT INTO'. This SQL statement is used to add new rows of data into an existing database table. It allows the data analyst to insert specific values into specified columns or insert values from a SELECT statement into the table. 

A dotted line connecting entities in an ERD typically represents a one-to-many relationship. This means that one instance of an entity can be associated with multiple instances of another entity, but each instance of the second entity can be associated with only one instance of the first entity. 

The Reorg utility in DB2 reorganizes both data and indexes in database objects. It rearranges the physical storage of data, eliminating fragmentation and reclaiming space, which helps in improving performance. Additionally, it also updates statistics for these objects. It does not create new tables or delete obsolete rows. 

The UNIQUE constraint in DB2 ensures that each value in a specified column or set of columns is unique across all the rows in the table. It prevents duplicate values from being entered into the table. 

The SUM() function in DB2 behaves by ignoring NULL values when applied to a column. It calculates the sum of all non-null values in the specified column. This behavior is important to understand when dealing with numerical data in DB2 queries, as it ensures that NULL values do not affect the calculation of sums. 

The correct answer is option D. You can verify a successful installation of DB2 by checking the presence of the db2level command. This command displays the DB2 product level and fix pack information, confirming a successful installation. 

In an Entity-Relationship Diagram (ERD), a diamond-shaped component represents relationships between entities. It signifies how entities are related to each other, whether it's a one-to-one, one-to-many, or many-to-many relationship. 

Primary keys in DB2 tables play a crucial role in ensuring the uniqueness of each row. They enforce entity integrity by ensuring that no two rows have the same values in the specified column or combination of columns. This uniqueness constraint helps maintain data accuracy and consistency. 

Weak entities are entities that do not have a primary key attribute on their own. They rely on a relationship with another entity (owner entity) for their existence.