Which two are valid choices for digital certificates when setting up two-way SSL between Salesforce and an external system. Choose 2 answers

Which two are valid choices for digital certificates when setting up two-way SSL between Salesforce and an external system. Choose 2 answers
A . Use a trusted CA-signed certificate for salesforce and a trusted CA-signedcert for the external system
B. Use a trusted CA-signed certificate for salesforce and a self-signed cert for the external system
C. Use a self-signed certificate for salesforce and a self-signed cert for the external system
D. Use a self-signed certificate for salesforce and a trusted CA-signed cert for the external system

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Answer: C,D