With explanation Please.

#include #include int main void ) fork fork fork execip ( "/bin/ls", return 0 /* Line A /* Line B/ /*Line C/ /. Line D ./ "ls", NULL); Answer the following: (a) Including the initial parent process, how many processes are created by the program? (b) Answer (a) assuming that lines C and D are interchanged in the program (c) Answer (a) assuming that lines B and D are interchanged (instead of C and D) in the program