Message from the letters?

Question

Decode the message "JCXG C PKEG FCA RCTCOCSWG." Of the four ways in which this coding function was described, which did you use?

Answer 1

It's say "HAVE A NICE DAY PARANAQUE"

ex. a,b,c a=c ----d,e,f d=f----- b,c,d b=d