Write a program that creates four processes using the wait and fork function. The original process creates two children processes and then prints out parent. The children processes print child1 and child2, respectively. The first child process creates a child process that prints out grandchild. write a program that creates four processes. The original process creates two children processes and then prints out parent. The children processes print child1 and child2, respectively. The first child process creates a child process that prints out grandchild. The output must be guaranteed to print out in the following order.

grandchild

child1

child2

parent