What does a digital certificate certify about an entity?

What does a digital certificate certify about an entity?
A . A digital certificate certifies the ownership of the public key of the named subject of the certificate.
B . A digital certificate certifies the ownership of the private key of the named subject of the certificate.
C . A digital certificate certifies the ownership of the symmetric key of the named subject of the certificate.
D . A digital certificate certifies the ownership of the bulk encryption key of the named subject of the certificate.

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Answer: A