I would like to know if I'm eligible for OPT? MBA after PhD in Engineering

I am an Indian citizen. I would like to know if I’m eligible for OPT? If not what are my other options? Following are my immigration details

(1) I came to US on F-1 visa to get my Masters in Engineering
(2) After completing my MS, I did not apply for OPT but joined PhD in Engineering in the same year
(3) I completed my PhD and got my OPT and fully used it
(4) Got employed on CAP EXEMPT H1B
(5) After two years, I joined MBA program on F-1
(6) I will be finishing my MBA in December 2016 and I would like to apply for OPT now.

Yes, you will be eligible for OPT based on your Masters but only 12 month as it is an MBA.