A customer has deployed a two node active-active IBM Sterling B2B Integrator (SBI) cluster in the secure zone on two servers. The customer has installed two servers in the DMZ for the purpose of…

A customer has deployed a two node active-active IBM Sterling B2B Integrator (SBI) cluster in the secure zone on two servers. The customer has installed two servers in the DMZ for the purpose of installing remote SBI Perimeter Servers to facilitate communications with external partners. External partners will connect to an external IP Load Balancer that will distribute inbound FTP/S, SFTP and HTTP Client sessions across the Perimeter Servers. The customer requirement is that if any single server fails, all the other SBI nodes and remote Perimeter Server instances must continue to activelyThe customer? requirement is that if any single server fails, all the other SBI nodes and remote Perimeter Server instances must continue to actively handle inbound sessions for each protocol. What is the minimum number of remote Perimeter Server instances that must be deployed in the DMZ?