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In an operating system, processes that are terminated but, for some reason must have its task structure in the process table are referred as __________.

1. Zombies
2. Orphans
3. Parent Process
4. Child Process

A zombie process is a process whose execution is completed but it still has an entry in the process table. Zombie processes usually occur for child processes, as the parent process still needs to read its child's exit status.

So, the correct answer is $(A).$