Samantha uses the ECDSA signature scheme with elliptic curve

 

E: Y = X + 13X +37 over F7331 and point G = (3297,3109) with order 101. Her public verification key is V = (3865, 4318). Victor claims that Samantha has signed each of the documents d=10, d'= 20, d" = 30 and that the associated signatures are (S, S) = (66,52), (S,S) (97,22). (ST.S) = (27,21) which of these are valid signatures? = 4