TCP allows for reliabilty in connections which would be required for terminal emulation.
The following answers are incorrect:
UDP. Is incorrect because with User Datagram Protocol (UDP) you don't have a reliable transmission, datagrams could arrive out of sequence.
SNMP. Is incorrect because it is a network management protocol, Simple Network Management Protocol (SNMP).
IGP. Is incorrect because Interior Gateway Protocol (IGP) is used interally on a network.

Explanation/Reference:
The main concern when recovering after a disaster is data, telecomm and IS facilities. Other services, in descending priority order are: IS operations, IS support services, market structure, marketing/public relations, customer service & systems support, market regulation/surveillance, listing, application development, accounting services, facilities, human resources, facilities security, legal and Office of the Secretary, national sales.
Source: BARNES, James C. & ROTHSTEIN, Philip J., A Guide to Business Continuity Planning, John Wiley & Sons, 2001 (page 129).

Section: Risk, Response and Recovery
Explanation/Reference:
Because it is rarely possible or cost effective to eliminate all risks, an attempt is made to reduce risks to an acceptable level through the risk assessment process. This process allows, from a set of potential risks (whether likely or not), to come up with a set of identified, possible risks.
The implementation of security controls allows reducing the identified risks to a smaller set of residual risks.
Because these residual risks represent the complete set of situations that could affect system performance, the scope of the contingency plan may be reduced to address only this decreased risk set.
As a result, the contingency plan can be narrowly focused, conserving resources while ensuring an effective system recovery capability.
Source: SWANSON, Marianne, & al., National Institute of Standards and Technology (NIST), NIST Special Publication 800-34, Contingency Planning Guide for Information Technology Systems, December 2001 (page
7).

Explanation/Reference:
The network layer contains the Internet Protocol (IP), the Internet Control Message Protocol (ICMP), and the Internet Group Management Protocol (IGMP)
The following answers are incorrect:
Datagram Layer. Is incorrect as a distractor as there is no Datagram Layer.
Transport Layer. Is incorrect because it is used to data between applications and uses the TCP and UDP protocols.
Data Link Layer. Is incorrect because this layer deals with addressing hardware.

Explanation/Reference:
If the protocol field has a value of 6 then it would indicate it was TCP.
The protocol field of the IP packet dictates what protocol the IP packet is using.
TCP=6, ICMP=1, UDP=17, IGMP=2
The following answers are incorrect:
ICMP. Is incorrect because the value for an ICMP protocol would be 1.
UDP. Is incorrect because the value for an UDP protocol would be 17.
IGMP. Is incorrect because the value for an IGMP protocol would be 2.
References:
SANS http://www.sans.org/resources/tcpip.pdf?ref=3871