Your organization has recently deployed a new public$-$facing web application hosted on the IP address $203\mathrm{.}0\mathrm{.}113\mathrm{.}45.$ To ensure proper email delivery from this application and to support certain integrations that rely on reverse DNS lookups, you decide to configure a PTR record.

What would be the correct configuration for the PTR record in the reverse DNS zone?

A$.$Add a PTR record for $45\mathrm{.}113\mathrm{.}0\mathrm{.}203.$in$-$addr.arpa pointing to your domain.

B$.$Add a PTR record for $203\mathrm{.}0\mathrm{.}113\mathrm{.}45.$in$-$addr.arpa pointing to your domain.

C$.$Add an A record for $203\mathrm{.}0\mathrm{.}113\mathrm{.}45$ pointing to your domain.

D$.$Add a PTR record for your domain pointing to $203\mathrm{.}0\mathrm{.}113\mathrm{.}45.$