There are four people: A. B, C, and D. If A is stocks, then B, C, and D are also stocks. If the above assertion is true, then which of the following must also be true. ['If A does not have stocks, then B, C, and D have no stocks.', 'If A does not have stocks, then at least one of B, C, and D have no stocks.', 'If B, C, and D are all stocks, then A is also stocks.', 'If Ding does not have stocks, then at least one of A and B does not have stocks.']