A(n) ________ is a group of cells which have been selected at the same time

One of the below programs that when called like this (with the underscore representing a digit from 1 to 4) generates this output:

``` >>> dup_("rubber duck") ’kcud rebburrubber duck’ ```

The term ____ means "many forms."

A. inheritance B. polymorphism C. UML D. virtual