Q19. After the following piece of code is executed strcpy (strl, "aaa") strcat(strl, "bbb") a) str1 is "aaa c) str1 is "aaabbb b) str1 is "bbb d) str1 is "bbbaaa" Q20. What does the following piece of code do? void main) int *pi a) declares p as an integer to a pointer b) declares p as an integer variable c) declares p as a pointer variable d) declares p as an uninitialized integer variable