Which two approaches should an Integration Architect recommend to allow access to on-premise systems by Salesforce? Choose 2 answers

Which two approaches should an Integration Architect recommend to allow access to on-premise systems by Salesforce? Choose 2 answers
A . Place the systems in aDM
C . Whitelist Salesforce IPs on the firewall.
D . Utilize two-way(mutual) SSL
E . Whitelist the corporate IPS in Salesforce.

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Answer: B,C