Confusion in finding follow of Gammar

Question

I have confusion in finding follow of Grammar

S->(L)|a
L->L,S|S

Follow(L)={$,} or Follow(L)= {$}
Which one is right and why?

Answer 1

Both are incorrect.

FOLLOW(A) of non-terminal A is the set of terminal symbols 
that can follow in the derivation sequence

FOLLOW(L), check where it appears in the right hand side of productions. It is there in

             S->(L)  

when this production is considered for derivation, what follows L is ).

            L->L,S

similarly, when this production is considered for derivation, what follows L is,.

           FOLLOW(L) = {),,}