Which type of content control displays a box that can be selected or cleared?

The NEVER function allows creation of logical statements in which it creates the opposite or reverse result

Indicate whether the statement is true or false.

Assigning a subclass reference to a superclass variable is safe ________.

a. because the subclass object has an object of its superclass. b. because the subclass object is an object of its superclass. c. only when the superclass is abstract. d. only when the superclass is concrete.