What does the bind() method do in the following code? var tax = { rate: 0.075, calc: function(sub) { return sub + (sub * this.rate)).toFixed(2); }, displayFullPrice: function(subtotal) { return function() { alert(this.calc(subtotal)); }.bind(this); } };

	a.	It sets the value of the this keyword in the displayFullPrice method to the object that calls the method.
	b.	It sets the value of the this keyword in the displayFullPrice method to the tax object.
	c.	It binds the displayFullPrice method to the tax object.
	d.	It throws an exception.