Below are given names of a few lakes of India. Group them into two categories: natural and created by human beings.
(a) Wular (h) Chilika
(b) Dal (i) Sambhar
(c) Nainital (j) Rana Pratap Sagar
(d) Bhimtal (k) Nizam Sagar
(e) Gobind Sagar (l) Pulicat
(f) Loktak (m) Nagarjuna Sagar
(g) Barapani (n) Hirakund