Because of software at the ________________ layer, a user can choose to use one of several programs to access a file over the network.

The ________ feature of Excel is used to automatically change the column width to accommodate the longest entry

A) AutoFit B) data marker C) truncation D) unhide

Which of the following are valid on the left side of an assignment operator?

A. A numeric constant B. An expression such as 8*6 C. A declared constant D. A variable