The CA's public key IS included in the server certificate - it's necessary to verify the certificate's signature.
An OID is just a standardized identifier for different certificate fields/extensions (like extended key usage, key purpose, etc). It's not unique to the server.
They are dotted decimal numbers that would assist with identifying objects. That is why its OID, that is what it does. Now other way to verify is by knowing that Certificate is an subject.
I believe, correct me if I'm wrong that this is one question where you have to exclude the wrong answer; my reasoning behind it is that A) the CA public key is stored in the CA certificate, B) the server private key is generated to sign the CSR, C) the Certificate Signing Request is a request made to a CA to get a certificate from them and D) OID Object IDentifier is one of the pieces of info stored in a certificate. Therefore it must be OID because it is the unique object identifier for the server and is stored in its certificate.
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