DSE 2007 Q.11 - Quasiconvexity

[Do bats eat cats?]

The answer is (a).
Isn't the function  convex too?

[Ankit]

http://www.economics.utoronto.ca/osborne/MathTutorial/QCC.HTM

"A concave function is quasiconcave. A convex function is quasiconvex."

"The converse of this result is not true: a quasiconcave function may not be concave"

[Do bats eat cats?]

Thanks for replying Ankit.

I understand that convexity implies quasiconvexity, and not the other way round.
I'm asking whether or not  is convex. If it is convex, (according to me it is), then option (c) should be correct too, right?

[duck]

Hi "Do bats eats cats".. :)

e^-x is also convex. Both (a) and (c) are correct.. :)

[Ankit]

Hi duck, can you pls have a look at DSE Type Test question 19 too.

Thanks

[Do bats eat cats?]

Thanks duck! :)