What is the correct way to recite Darood Sharif - Durood e Ibrahim?

I have been listening Darood Sharif on youtube and I have notice reciter say Muhammadin and other reciter say Muhammad.

Also reciters say Ibraheem and Ibraheema.

So for example:

Allah humma sal-li 'ala Muhammad*in*

wa 'ala ali Muhammad*in*,

Kama sal-layta 'ala Ibrahee*ma*

Wa'ala ali Ibrahee*ma*

innaka Hameedum Majeed

Allah humma sal-li 'ala Muhammad*in*

wa 'ala ali Muhammad,

Kama sal-layta 'ala Ibraheem

Wa'ala ali Ibraheema

innaka Hameedum Majeed

So which is the correct way to recite Darood Sharif - Durood e Ibrahim when praying salaat?

There is no answers. Be the first answerer.