To provide stronger authentication for Cisco UCS Manager, you are installing a third-party certificate from a trusted point. Which format must the certificate be in?

DER (Distinguished Encoding Rules) is a binary encoding format for X.509 certificates, but CER (X.509) specifies the standard itself which is more precisely what UCS Manager requires.

PEM (Privacy-Enhanced Mail) is a base64 encoded text format for X.509 certificates, but CER (X.509) more explicitly identifies the underlying standard required by UCS Manager.

CRT is a common file extension for certificates, often referring to X.509 certificates, but CER (X.509) provides a more specific reference to the required X.509 standard.

Cisco UCS Manager specifically requires X.509 standard certificates for secure third-party authentication and trust establishment, and the `.cer` extension commonly indicates a certificate conforming to this standard, often in binary DER encoding.