A(n) ____ is a name that refers to a piece of the program’s memory, in which a value can be stored, retrieved, and changed.

____________ provides a general purpose query facility  that can be used with not only relational data sources, but XML data, and any class of data that implemented the IEnumerable interface with IEnumerable supporting simple iteration over a collection.

Fill in the blank(s) with the appropriate word(s).

?To create a class selector, the style rule should begin with a _____ followed by the class attribute value.

A. ?semi colon B. ?comma C. ?period D. ?hash tag