The correct answer is A.
OBJ-4.2: You should create an out-of-band management network and use an SSH (console) connection to reach the routers. Out-of-band (OOB) management is a method of remotely controlling and managing critical IT assets and network equipment using a secure connection through a secondary interface that is physically separate from the primary network connection. HTTP will not create an encrypted channel and should not be used for remote connections. SNMP can be used on local area networks to send and receive data about the different network devices, but it will not provide any additional security over the methods currently being used by the company. Using a modem is also a bad security practice since these are subject to war dialing and provide slow connectivity speeds.