State action potential in this graph

State potential difference during rest?
http://sub3.rofof.com/img5/04dcszt30.jpg

The graph represent that the nerve impulse through nerve fiber expressed as waves of depolarization and repolarizaion

From the graph state:-
(a) potential difference during rest
(b) potential difference during stimulation
(C) action potential

(a) -70mV
(b) -50mV (threshold)
(c) From -50mV to +35mV