Double-clicking a tab marker on the ruler will ________

A(n) ________ sets the property of a field to force data entry

A) input mask B) required C) data macro D) default value

Which of the following is false?

a. A string can be defined to store any data type. b. Class string provides bounds checking in its member function at. c. Class string’s overloaded [] operator returns a vector element as an rvalue or an lvalue, depending on the context. d. An exception is thrown if the argument to string’s at member function is an invalid subscript.