Directions:- Study the following information carefully to answer the question given below.
A, C, D, I, L, P and M are sitting in a straight line facing North.
(a) P sits fourth to the right of A and C sits second to the left of P. D sits in the middle and is second to the right of M.
(b) I sits at the farthest possible distance from P (five persons sits between I and P).
If all the seven persons are made to sit in alphabetical order from left to right, the positions of how many will remain unchanged as compared to the original seating positions?