<span>B. Efficiency
(</span><span>effective training </span><span>techniques)</span>
Answer:
MULTITASKING OS
Explanation:
MULTITASKING OPERATING SYSTEM is an operating system that enables and allow user of either a smartphone or computer to make use of more that one applications program at a time.
Example with MULTITASKING OPERATING SYSTEM smartphones user can easily browse the internet with two applications program like chrome and Firefox at a time or simultaneously
Therefore a user working with two apps simultaneously is an example of a unit that uses a MULTITASKING OS.
The best thing to do when an error message appears when it is not supposed to, as in if you are blocked by an administrator and it appears then its supposed to, it is best to contact someone who can investigate whether or not something is happening to your computer. That could be a parent, if they are good with computers, or just tech support at a store, provided they also know computers. Most of the time your computer just makes a mistake so nothing to worry about, but make sure to have it checked just to be sure.
