Create a C program at /app/fork posix.c that demonstrates POSIX process creation using fork() .

Create a C program at /app/fork posix.c that demonstrates POSIX process creation using fork() .: a task in rts-1k-rootless-apptainer: RTS-1K: offline rootless Apptainer release (Harbor dataset). What the agent is asked, how it is graded, what it runs in, and its files.