Switches: select one:
a. operate at the physical layer only
b. connect two or more network segments that use different data link protocols
c. connect two or more network segments that use different network protocols
d. learn addresses by reading the source and destination addresses

b. connect two or more network segments that use different data link protocols

Explanation:

A switch is an analog device that allows to interconnect networks, it is possibly one of the devices with a higher level of scalability. It is important to clarify that a Switch does not only provide connectivity with other networks, nor does it provide connectivity with the Internet, for this purpose a router is necessary.  

yes we can change both the color of the value of a cell as well as background color of a cell at the same time .

as we know that excel sheet consists of columns and rows.

and intersection of column and row is called cell.

we can change color of the cell and background of the cell at the same time.

hence the statement that

can a person change color of the cell and background of the cell at the same time is true.