When you use DNS to find a hostname using a particular IP address, which kind of DNS entry is involved?

When you use DNS to find a hostname using a particular IP address, which kind of DNS entry is involved?

A.
Reverse DNS entries

B.
IP DNS entries

C.
Address DNS entries

D.
Network DNS entries

Explanation/Reference:
Normally DNS resolves hostnames to IP addresses, if you use an IP address to find a hostname use RDNS.