Final answer:
A method is a sequence of instructions that could access the data of an object. Method names do not have to be unique across the entire program.
Step-by-step explanation:
The correct statement about methods is:
a) A method is a sequence of instructions that could access the data of an object.
A method is a block of code that performs a specific task when called by its name. It can access and modify the data of an object it is associated with. Methods are essential in object-oriented programming to encapsulate functionality and provide reusability.
Option b) is incorrect because method names do not have to be unique across the entire program, as each class can have its own methods with the same name. Option c) is incorrect because methods can only be called on objects of their associated class or subclass. Option d) is incorrect because methods are not stored in variables; they are defined within classes and called on objects.