Ali is creating a document on a system using his login credentials. His colleague needs to use his system to access documents. His colleague does so with his own credentials while Ali is still logged in. What type of OS allows this kind of operation?

A.
single-user/single-tasking
B.
single-user/multitasking
C.
multiuser/single-tasking
D.
multiuser/multitasking

The answer is d ? ); ))4))

The answer is  c. 1, 1, 1.b89 is an absolute reference. there are no dollar signs indicating relativity.p$90 is a mixed reference. the p column is absolute, but the row is relative as indicated by the dollar sign in front of the row number. it's a mix of absolute and relative.$d$34 is a relative reference. both the column and the rows have dollar signs in front of them, so the entire thing is relative.there's only one of each.

This is my second one

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