Final answer:
A constructor is a special method used to initialize objects in a class. Option II and option III can be constructors, while option I cannot. The correct answer is a. II & III only.
Step-by-step explanation:
A constructor is a special method that is used to initialize objects in a class. It has the same name as the class and does not have a return type. In the given options, only option II and option III can be constructors. Option II is a default constructor, which takes no arguments, and option III is a parameterized constructor, which takes two integer arguments. Option I cannot be a constructor because it is a static method and does not have the same name as the class. Therefore, the correct answer is a. II & III only.