Jonathan Is About to Create His First Web Site

Multiple Choice

Jonathan is about to create his first Web site. He has been reading up on file naming conventions, but still isn't sure about certain points. He asks you for help.
-Jonathan read somewhere that he shouldn't use spaces in HTML file names. He wants to know if there is a commonly used alternative. You tell him that ____.

A) there is no alternative, and he should just run multiple words together
B) he should use the underscore character to separate words
C) the best alternative is to use "%20" and hope that viewers won't encounter an error
D) he's mistaken, and he can use spaces with no chance of any errors