Correct way to answer to "Is Keelan there?"?

Question

When someone calls, and i pick up, and they ask "Hello, is Keelan there?" is it correct to answer saying "This is He" or "This is him"??

Answer 1

it is obviously

"this is him."

DUHHHHH.

Answer 2

Between those two, it is better to say "This is he."

However, the politest way possible is probably "This is Keelan speaking."

Answer 3

Speaking!

The most accurate and not problematic answer.