C-01-Q117mediumsingle_mcqIf A⊂BA \subset BA⊂B and C⊂DC \subset DC⊂D, then:aA×C⊄B×DA \times C \not\subset B \times DA×C⊂B×DbA×C⊂B×DA \times C \subset B \times DA×C⊂B×DcA×C=B×DA \times C = B \times DA×C=B×DdA∩C=B∩DA \cap C = B \cap DA∩C=B∩D