Lets draw a picture of each part of the given figure:
So, the surface area is the sum of of the area of 3 equal rectangles and 2 equal triangles. The area of a triangle is:

in our case, we have

which gives

On the other hand, the area of a rectangle is

in our case we get

Then, the surface area is given by

That is

Then, the answer is

which corresponds to option 3