Black-box and white-box testing method ale often used in software testing phase, in which, the white-box is mainly used to test software's (73) . A: external function of a program B: reasonableness of structure C: internal logic of a program D: correctness of a program

Black—box and white — box testing method are often used in software testing phase, in which, the white—box is mainly used to test software's( ). A: reasonableness of structure B: correctness of a program C: external function of a program D: internal logic of a program