Which of the following is a secant?

Answer:
The secant in the following figure is line:
EF
Step-by-step explanation:
Secant--
A secant is a line that cut the curve at atleast(minimum) two(distinct) points.
Clearly from the figure we could see that:
AC is a diameter of the circle.
Hence, the answer is:
Line EF.
(Since it cut the curve and two point and also extend infinitely in both the directions )