Which formats should you upload the certificate?

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You have an Azure subscription named Subscription1.
In Subscription1, you create an Azure web app named WebApp1. WebApp1 will access an external service that requires certificate authentication.
You plan to require the use of HTTPS to access WebApp1.
You need to upload certificates to WebApp1.
In which formats should you upload the certificate? To answer, select the appropriate options in the answer area.
NOTE: Each correct selection is worth one point.
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Correct Answer:

Explanation/Reference:
A PFX file contains the public key file (SSL Certificate) and its unique private key file. This is required for HTTPS access. The web app will distribute the public key (in a CER file) to clients that connect to the web app. The CER file is an SSL Certificate which has the public key of the external service. The external service will have the private key associated with the public key contained in the CER file.
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