Correct Answer: C, ETo ensure secure communications between clients and servers in a VMware Cloud Director deployment, it is recommended to create two certificates for the server group and import the certificates into each cell's keystore. This ensures each cell has the necessary credentials to establish secure connections. Additionally, using a wildcard certificate and importing it into each cell's keystore is beneficial, as it simplifies certificate management and ensures uniform security across the deployment. These steps help establish a trusted communication environment, preventing potential security vulnerabilities associated with self-signed certificates or incomplete certificate setups.