Case 5-1 Ethan Would Like to Minimize His Efforts in the Development

Multiple Choice

Case 5-1
Ethan would like to minimize his efforts in the development of his Web site.Kyra is ready to help him apply a variety of background properties.
-Ethan knows that there are several keywords that describe the position of the background image behind the element,but he does not know how these keywords are used as a value for the background-position property.Kyra explains to him that there are nine keywords and she lists some of them.Which one of the following is NOT a valid keyword?

A) left center
B) bottom left
C) top right
D) center center