According to the 73rd Amendment which of the following are optional provisions left to the state governments regarding the organization of Panchayati Institutions?
(a) 2 - 3 tier structure
(b) Fixed tenure
(c) Role and scope of Gram Sabha
(d) District Planning Committees
1. (c) and (d)
2. (a) and (b)
3. (b) and (d)
4. (a) and (c)
5.