How many groups of people mocked at Jesus on the cross according to ST Mark's gospel?

According to Mark's gospel, there were two groups of people who mocked Jesus on the cross. The first group were the chief priests and scribes who were present at the crucifixion and mocked Jesus, saying "He saved others; himself he cannot save" (Mark 15:31). The second group were the people who passed by the cross and also mocked Jesus, wagging their heads and saying "Aha! You who destroy the temple and build it in three days, save Yourself, and come down from the cross!" (Mark 15:29-30). Therefore, the answer is (a) Two.