Exam-style application: In an AP CSA writing classes setting, use class headers, private instance variables, constructors, accessors, mutators, static versus instance members, toString, and client-code traces. Which variable should be shared by all User objects to count how many have been created? Provide the solution as code.

Exam-style application: In an AP CSA writing classes setting, use class headers, private instance variables, constructors, accessors, mutators, static versus instance members, toString, and client-code traces. Which toString method returns a point as (x, y)? Provide the solution as code.

Exam-style application: In an AP CSA writing classes setting, use class headers, private instance variables, constructors, accessors, mutators, static versus instance members, toString, and client-code traces. Which declaration correctly begins a public class named Student with a private instance variable name? Provide the solution as code.

Exam-style application: In an AP CSA writing classes setting, use class headers, private instance variables, constructors, accessors, mutators, static versus instance members, toString, and client-code traces. Which constructor correctly initializes existing private fields title and author in a Book class? Provide the solution as code.

Exam-style application: In an AP CSA writing classes setting, use class headers, private instance variables, constructors, accessors, mutators, static versus instance members, toString, and client-code traces. A field is declared private boolean available;. Which accessor is valid AP CSA style? Provide the solution as code.

Exam-style application: In an AP CSA writing classes setting, use class headers, private instance variables, constructors, accessors, mutators, static versus instance members, toString, and client-code traces. Which setter preserves encapsulation while rejecting negative scores? Provide the solution as code.