pls i need help

Which of the following functions is on density function of a continuous random Variable. 1 . F X Q ) - else where 2 . ( x 6. ) - 0 elsewhere F X Q ) = $20 if - 12 240 If D E x 2 2 12 0 elsewhere FX GC ) = [ 202 04 1 14 0.4 06 2 2 0 else where 5 : Fix GC ) 20' if 0 6 2 2 2 0 else where