The multitasking, multi-user, operating system developed by Bell Laboratories that operates on a wide variety of computing platforms is Unix. Linux. OS X. COBOL.

Unix

Explanation:

UNIX is simply an operating system developed by Bell Laboratories in the 1960s. Ever since then, it has been constantly worked upon and developed. It is an operating system because it is a suite of programs capable of making a computer to function. Unix is considered to be a stable, multi-user, and multi-tasking system for both desktops and laptops and even servers.

just dont use the app.its not a good one,consumes a lot of ur head without any benefits

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