Which of the following is not true about the ability of a computer to do several tasks at the same time $($multi$-$tasking$).$

Question $6$ options:

Only multiple cores can execute more than one tasks at once

A single core processor can do more than one task at the same time.

Operating systems create the illusion of performing multiple tasks at the same time by frequently and quickly switching between them $($task switching$).$

Frequent task switching is less efficient than completing each task in sequence $-$ one at a time.