Read the following passage and solve the questions based on it.
Nine individuals—Z, Y, X, W, V, U, T, S and R are the only candidates who can serve on three committees–A, B and C: and each candidate can serve on only one of the committees. The following conditions are given:
(i) Committee A should consist of exactly one member more than committee B.
(ii) It is possible that there are no members of committee C.
(iii) Z, Y and X cannot serve on committee A.
(iv) W, V and U cannot serve on committee B.
(v) T, S and R cannot serve on committee C.
In case T and Z are the individuals serving on committee B, how many of the nine individuals should serve on committee C?