Which among the following Panchayat, are included in the District Plan in U.P?

I. nagar panchayat
II. Gram Panchayat
III. Kshetra Panchayat
Select the correct answer from the codes given below:
Codes:
(a) I only
(b) I and II only
(c) II and III only
(d) I, II and III all