Servers handle requests for other domains _______a.it is not possibleb.none of the mentionedc.by contacting remote DNS serverd.directly

The answer is c. Servers handle requests for other domains by contacting remote DNS servers.

Here's a step-by-step explanation:

1. When a server receives a request for a domain that is not within its local DNS (Domain Name System), it needs to contact another server that can resolve the domain name.

2. The server will then contact a remote DNS server. This is a server that is not on the local network and is usually owned and managed by a different organization.

3. The remote DNS server will then look up the domain name in its DNS records.

4. If the remote DNS server can resolve the domain name, it will return the corresponding IP address to the original server.

5. The original server can then use this IP address to fulfill the original request.

So, servers handle requests for other domains by contacting remote DNS servers.