Which of the following commands pings the loopback address?

A(n) ________ on one end of a relationship indicates that none of the entity are a possibility.

A) circle or zero B) single line C) crow's foot D) circle and a single line

____________________ images cannot be used with the alt attribute, which a screen reader needs in order to describe an image.

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