When should you use a const reference parameter?

Question 12 options:

	Whenever the data type might be many bytes, and the function does not change the parameter within its body.
	Whenever the data type might be many bytes, the function changes the parameter within its body, and you do NOT want these changes to alter the actual argument.
	Whenever the data type might be many bytes.
	Whenever the data type might be many bytes, the function changes the parameter within its body, and you DO want these changes to alter the actual argument