Which of the following is a falsy value??

Which of the following should a technician do last after cleaning up a virus infection?

a. Enable system restore and create restore point b. Educate the end user c. Update anti-virus software d. Schedule scans and updates

Consider the following class definitions:class bClass{public:void set(double a, double b);//Postcondition: x = a; y = b;void print() const;bClass();//Postcondition: x = 0; y = 0;bClass(double a, double b);//Postcondition: x = a; y = b;private:double x;double y;};class dClass: public bClass{public:void set(double a, double b, double c);//Postcondition: x = a; y = b; z = c;void print() const;dClass();//Postcondition: x = 0; y = 0; z = 0 ;dClass(double a, double b, double c);//Postcondition: x = a; y = b; z = c;private:double z;};Which of the following dClass constructor definitions is valid in C++?

A. dClass::dClass(double a, double b, double c) : bClass() { x = a; y = b; z = c; } B. dClass::dClass(double a, double c) { x = a; z = c; } C. dClass::dClass(double a, double b) : bClass() { x = a; y = b; } D. dClass::dClass(double a, double b, double c) : bClass(a, b) { z = c; }