8 friends in 3 diff colleges

P, Q, R, S, T, V, W and Z are eight friends studying in three different engineering colleges - M, N and O in three disciplines - Mechanical, Electrical and Electronics with not less than two and not more than three in any college. Not more than three of them study in any of the three disciplines. 

• W studies Electrical in college N with only T, who studies Mechanical.
• P and Z do not study in college O and study in the same discipline but not Electrical. 
• R studies Mechanical in college O with V, who studies Electrical.
• S studies Mechanical and does not study in the same college where R studies. 
• Q does not study Electronics.

Which of the following combinations of college-student specialization is correct?
1) O-R-Electronics 
2) M-Z-Electrical
3) N-W-Electronics 
4) N-W-Electrical
5) N-Z-Electronics

Watch this space for answer in a week.