Question #0Why should we use include guards in our header files?To avoid the problem of double inclusion when dealing with the include directive.Because we said so, and we should never ask why.Question #1What is the gcc option that runs only the preprocessor?-cisfun-preprocessor-E-p-pedantic-P-aQuestion #2The preprocessor links our code with libraries.FalseTrueQuestion #3This code will try to allocate 1024 bytes in the heap:#define BUFFER_SIZE 1024malloc(BUFFER_SIZE)FalseTrueQuestion #4This is the correct way to define the macro SUB:#define SUB(a, b) a - bNo, it should be written this way:#define SUB(a, b) ((a) - (b))No, it should be written this way:#define SUB(a, b) (a) - (b)No, it should be written this way:#define SUB(a, b) (a - b)YesQuestion #5What will be the last 5 lines of the output of the command gcc -E on this code?#include <stdlib.h>int main(void){ NULL; return (EXIT_SUCCESS);}int main(void){ '\0'; return (0);}int main(void){ ((void *)0); return (0);}int main(){ 0; return (0);}int main(void){ 0; return (0);}Question #6What will be the output of this program? (on a standard 64 bits, Linux machine)#include <stdio.h>#include <stdlib.h>#define int charint main(void){ int i; i = 5; printf ("sizeof(i) = %lu", sizeof(i)); return (EXIT_SUCCESS);}sizeof(i) = 4sizeof(i) = 1sizeof(i) = 8sizeof(i) = 5It does not compileSegmentation FaultQuestion #7NULL is a macroFalseTrueQuestion #8The preprocessor removes all commentsFalseTrueQuestion #9The preprocessor generates object codeFalseTrueQuestion #10The preprocessor generates assembly codeFalseTrueQuestion #11What are the steps of compilation?preprocessor 2.compiler 3. linker 4. assemblerpreprocessor 2.compiler 3. assembler 4. linkercompiler 2. preprocessor 3. assembler 4. linkerQuestion #12The macro __FILE__ expands to the name of the current input file, in the form of a C string constant.FalseTrueQuestion #13What does the macro TABLESIZE expand to?#define BUFSIZE 1020#define TABLESIZE BUFSIZE#undef BUFSIZE#define BUFSIZE 37nothing371020Question #14This portion of code is actually using the library stdlib.#include <stdlib.h>FalseTrueSubmit answers