The ............ operating system was initially created in the early 1970s at AT & T Bell Labs.

Answer: Option C

The Unix operating system was initially created in the early 1970s at AT & T Bell Labs. The history of Unix dates back to the mid-1960s. When the Massachusetts Institute of Technology, AT & T Bell Labs and General Electric were jointly developing an experimental time-sharing operating system called Multics for the GE-645 mainframe.