Decrypt the following messages encrypted using the Caesar cipher:
$f(p) = (p+3) \text{ mod } 26$
Alphabet: A,B,C,D,E,F,G,H,I,J,K,L,M,N,O,P,Q,R,S,T,U,V,W,X,Y,Z
(a) EXVB KRVSLWDO

(b) GR QRW SDVV JR

(c) WORICSNY