what meaning of options edns0 trust-ad

EDNS0 (Extension mechanisms for DNS 0) is a protocol extension that allows DNS clients and servers to exchange additional information beyond the basic DNS protocol. The "options edns0" refers to the use of EDNS0 options in DNS queries and responses.

"Trust-AD" is an EDNS0 option that allows DNS clients to indicate to servers that they trust the Active Directory (AD) domain name system. This option is used in conjunction with DNSSEC (DNS Security Extensions) to provide additional security for DNS queries and responses.

In summary, the "options edns0 trust-ad" means that the DNS client is using EDNS0 options in its queries and responses and trusts the AD domain name system for additional security