How does a DNS CNAME record relate to a webserver "VirtualServer" directive? Select one: a. the CNAME binds an IP address to a hostname and the VirtualServer binds the hostname to the DocumentRoot and ScriptAlias b. the CNAME binds a URL to a port and the VirtualServer binds the port to the DocumentRoot and ScriptAlias c. the CNAME binds a unique IP address to each VirtualServer and the VirtualServer binds the URL to the DocumentRoot and ScriptAlias d. the CNAME binds an IP address to a hostname and the VirtualServer binds the HostPort to the DocumentRoot and ScriptAlias