A multiuser operating system specifically allows . multiple users concurrently
multiple processes concurrently
only one person at a time
only one process at a time

multiple users concurrently

Explanation:

A multiuser operating system specifically allows multiple users concurrently.

if you suspect that your immediate supervisor, department manager, or company is engaging in something unlawful you must do your best to end the misconduct immediately while also protecting yourself, your livelihood, and your family’s future.

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