________ Joe ________ Steve may go camping with you on Tuesday, because they are not allowed to go out on school days.
A:Either, or
B:Neither, nor
C:Both, and
D:Not only, but also
抛物线y2=4x的焦点为F,点Px,y为该抛物线上的动点,又点A-1,0,则PFPA的最小值是( )