According to the control chart theory, which of the following characteristics indicate that a process is out of control and requires attention to e...

According to the control chart theory, which of the following characteristics indicate that a process is out of control and requires attention to eliminate the cause of variation?
I - A point outside the control limits;
II - Seven points in a row above the central line or below the central line;
III - Six points in sequence steadily increasing or decreasing;
IV - Fifteen points in sequence in zone C (both above and below the central line);
V - Fourteen points in sequence alternately up and down;
VI - Eight points in sequence on both sides of the central line with none in zone C;
VII - An unusual or non-random pattern in the data;
VIII - One or more points near an alert or control limit.

a) I, II, III, IV, V, VI, VII and VIII.
b) I, II, III, IV, V, VI and VIII.
c) I, II, III, IV, V and VIII.
d) I, II, III, IV and VIII.