Implementing Cisco IP Switched Networks (SWITCH v2-0) (#125)

In the following partial output of the show run command, which MAC address or addresses will be removed from the list of secure addresses after 240 seconds?

0000.0000.aaaa
0000.0000.bbbb
0000.0000.aaaa and 0000.0000.bbbbb
none of the MAC addresses will be removed after 240 seconds