64. Operating systems must provide a mechanism for parent processes to create new child processes. Which of the following statements is true when a parent process creates new process?
- (A)
The parent continues to execute concurrently with its children
- (B)
The parent waits until some or all of its children have terminated
- (C)
The parent waits for the child process by issuing a signal ( ) system call
- (D)
Both (a) and (b)
