3COMPLETE the code in all the boxes given below as per instructions class 01 float f; public: 010: "010): void assign(float): // Write the prototype to return the average of the values of four objects. 7/Write the function heading & a COMPLETE method "AVERAGE" to return the average of the values of four objects // Write a CALLING statement to "AVERAGE" method. Make sure that all the variables/parameters in the calling statement are valid before the method is called