312-92 Question #28: Real Exam Question with Answer & Explanation

Gregory is a system administrator who oversees 15 Mac OS X servers for his company. Three of his servers are at remote sites, but they still need to replicate and communicate with the servers at the main office. Gregory wants to use SSL to protect the LDAP traffic between all servers for security. For this to work properly, what port must be opened on the firewalls so that the SSL LDAP traffic can pass through?