Which of the Following Identify a Likely Out-Of-Control Condition in a Control

Multiple Choice

Which of the following identify a likely out-of-control condition in a control chart (three correct answers) :

A) consistently increasing value of $\bar{x}$
B) points near the central line
C) points oscillating back and forth across the central line
D) R outside the control limits of the R chart
E) sample points consistently slightly above the central line
F) $\bar{x}$ outside the control limits of the $\bar{x}$ chart?