Dynamic testing techniques involve the actual execution of the software. It's performed when the code is run, as opposed to static testing which is performed without executing the code. Dynamic testing validates the software system in a runtime environment.

The "Exhaustiveness" principle suggests that it's impractical and non-feasible to test all possible combinations and scenarios in a software application due to constraints like time, resources, and the infinite possibilities. Instead, focused and effective testing is carried out based on risk and priority.

Usability Testing is a type of software testing where the primary focus is to ensure that the application is user-friendly, intuitive, and easy to understand. It ensures that the end-users can efficiently complete their intended tasks without facing unnecessary obstacles or confusions.

Stress testing is a dynamic testing technique used to determine how a software system behaves under conditions that are not normal or expected, such as under extreme loads, limited memory, or when subjected to hacking attempts. Its main goal is to ensure the software doesn't crash in suboptimal conditions.

The main purpose of static analysis in software testing is to identify defects in the early stages without having to actually execute the code. This is beneficial as it helps in improving the quality of the code and reduces the cost of fixing defects at later stages.

The prototype of a function includes the function's name, return type, and the types of its parameters. It provides a declaration of the function's signature, allowing the compiler to check function calls for correctness.

The freopen() function in C is used to redirect standard streams, such as stderr, to a specified file, enabling error messages to be stored in a file instead of the console.

To open a file for both reading and writing in C, you should use the "r+" mode with the fopen function. This mode allows you to perform both read and write operations on the file.

In C, the 'printf()' function is used to display output on the console.

The fopen function in C is used to open a file for reading. It returns a file pointer that can be used to read data from the file.

The correct answer is B) switch. The switch statement is ideal for situations where you want to execute different code blocks based on the value of a variable (in this case, the day of the week).

The correct option is 1. Using a struct with three integer fields is the most efficient way to represent a pixel in C because it encapsulates the RGB values as a single unit, making it easy to work with. The other options would be less efficient and less organized.