Children, in my opinion, ________ creative ability is unthinkably rich, ________ is seldom taken notice of by us, should be trained in that area.

A．which; that

B．whose; which

C．which; which

D．whose; that

软件可维护性度量的七个质量特性是可理解性、可测试性、可修改性、可靠性、 ______、可使用性和效率。