How many calls to function power will there be in the call power (2, 6)?

What mistake prevents the following class declaration from functioning properly as an abstract class?

class Shape { public: virtual double print() const; double area() const { return base * height; } private: double base; double height; }; a. There are no pure virtual functions. b. There is a non-virtual function. c. private variables are being accessed by a public function. d. Nothing, it functions fine as an abstract class.

When using the LastIndexOf method with three arguments, the second parameter specifies:

a) the length of the substring to search b) the starting index of the string to search c) the ending index of the string to search d) the string to search for