Given the graph of below, at which of the marked -values can the following statements be true?

graph of a function

(For each question, enter your answer as a comma-separated list, e.g., x1,x3,x5. Enter none if no points satisfy the given condition)
A. at
B. at
C. is decreasing at
D. is decreasing at
E. The slope of is positive at
F. The slope of is positive at

You can earn partial credit on this problem.