Question

Which is a secant?

Answer 1

Picture please!

Answer 2

We know that in geometry a secant is a line that intersect the circle or any curve in atleast two distinct points.
In this, the curve is a circle.

Answer 3

its right?

Answer 4

Hence, the secant is:  CD

( Also   MH is not a secant since it does not intersect the curve at any point.

Also   CT is not a secant because it is not a line, it is a line segment although it intersect the curve at two distinct points )