Reference the following four symbols, designated by A, B, C and D OE Select all of the following statements that are true, as related to each corresponding letter. a) Symbol "A" indicates optional relationship participation on the "many" side of the relationship. b) Symbol "A" requires at least one corresponding occurrence on the "many" side of the relationship. ) Symbol "B" denotes a relationship where a single corresponding occurrence on the many" side of the relationship satisfies the symbol requirement. d) Symbol "C" should be read as "one and only one". e) Symbol "D" indicates a weak relationship