What length of rope must the operator pull and what is the ideal mechanical advantage (MA) of the pulley system if the 15 N load is to be raised 1 m? (Assume the rope is sufficiently long to accommodate movement of the load and that all pulleys are frictionless.) A 1.0 m, MA=3 B 3.0 m, MA=3 C 1.0 m, MA=1/3 D 3.0 m, MA=1/3