Your organization has had a few recent DDoS attacks. You need to authenticate responses to domain name lookups. Which Google Cloud service should you use?
Answer is (A).
The Domain Name System Security Extensions (DNSSEC) is a feature of the Domain Name System (DNS) that authenticates responses to domain name lookups. It does not provide privacy protections for those lookups, but prevents attackers from manipulating or poisoning the responses to DNS requests.
https://cloud.google.com/dns/docs/dnssec
To authenticate responses to domain name lookups and protect your organization from DDoS attacks, you can use Cloud DNS with DNSSEC. DNS Security Extensions (DNSSEC) is a feature of the Domain Name System (DNS) that authenticates responses to domain name lookups and prevents attackers from manipulating or poisoning the responses to DNS requests. Cloud DNS supports DNSSEC and automatically manages the creation and rotation of DNSSEC keys (DNSKEY records) and the signing of zone data with resource record digital signature (RRSIG) records. By enabling DNSSEC in Cloud DNS, you can protect your domains from spoofing and poisoning attacks.
Keyword here is domain name lookup so it must be A.
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