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【单选题】
有如下类声明： class XA { int x; public: XA(int n) {x=n;} }; class XB: public XA{ int y; public: XB(int a,int b); };在构造函数XB的下列定义中，正确的是______。A.
XB:: XB(int a, int b):x(a),y(b) { }
B.
XB::XB(int a, int b):XA(a),y(b){}
C.
XB::XB(int a,int b):x(a),XB(b)i}
D.
XB::XB(int a,int b):XA(a),XB(b){}
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