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CC3135MOD: For 802.1x Enterprise Security, what should be the format for the ca and key files? PEM or der?

Part Number: CC3135MOD

Hi,
I just want to clarify some things. Document: SWRU455M – FEBRUARY 2017 – REVISED OCTOBER 2020

From the userguide, it read:
• Client Authentication If the server requires client authentication, the following files are required:
– Private Key – Station (client) RSA private key file in PEM format
– Client Certificate – Certificate of the client, given by the authenticating network (has the public key matches to the private key) in PEM format

• Server Authentication The SimpleLink Wi-Fi device requires server authentication by default and the following file is required:
Server Root CA file – This file must be in PEM format. The demand for server authentication can be canceled through the WLAN setting. Canceling this authentication is valid for a single manual connection only.

And then later it says:

Those files must be programmed with the following names:
• Root CA – sys/cert/ca.der
• Client certificate – sys/cert/client.der
• Private key – sys/cert/private.key

I am confused.
Which format should be used? do I need to convert PEM to der? or just rename .pem to .der and .key?

Thanks in advance.