Provide the answerr and an explanation.

3. At which stage of the extended) compilation process are #define'd symbols replaced with their values? (a) Preprocessing (b) Compilation (c) Assembly (d) Linking 4. Which of the following constitutes a memory leak in a C program? (a) forgetting to free a pointer declared as static (b) calling fork before returning to the main function (c) returning a pointer to a locally declared array from a function (d) failing to free a previously dynamically allocated block of memory