Which of the following statements about good programming practice is correct?

A、Goodvariablenamesaregoodforbothdebuggingandmaintenance.;
B、Ifthereisalreadyprologuecomments,inlinecommentswon'tbeneeded.;
C、Codelayoutisforniceinterface.;
D、Nested"if"statementsshouldberecommended.