OTP or One Time Pad is considered unbreakable if the key is truly random and is as large as the plaintext and never reused in whole or part AND kept secret.
In cryptography, a one-time pad is a system in which a key generated randomly is used only once to encrypt a message that is then decrypted by the receiver using the matching one-time pad and key. Messages encrypted with keys based on randomness have the advantage that there is theoretically no way to "break the code" by analyzing a succession of messages. Each encryption is unique and bears no relation to the next encryption so that some pattern can be detected.
With a one-time pad, however, the decrypting party must have access to the same key used to encrypt the message and this raises the problem of how to get the key to the decrypting party safely or how to keep both keys secure. One-time pads have sometimes been used when the both parties started out at the same physical location and then separated, each with knowledge of the keys in the one-time pad. The key used in a one-time pad is called a secret key because if it is revealed, the messages encrypted with it can easily be deciphered.
One-time pads figured prominently in secret message transmission and espionage before and during World War II and in the Cold War era. On the Internet, the difficulty of securely controlling secret keys led to the invention of public key cryptography. The biggest challenge with OTP was to get the pad security to the person or entity you wanted to communicate with. It had to be done in person or using a trusted courrier or custodian. It certainly did not scale up very well and it would not be usable for large quantity of data that needs to be encrypted as we often time have today.
The following answers are incorrect:
-One time Cryptopad: Almost but this isn't correct. Cryptopad isn't a valid term in cryptography.
-Cryptanalysis: Sorry, incorrect. Cryptanalysis is the process of analyzing information in an effort to breach the cryptographic security systems.
-PGP - Pretty Good Privacy: PGP, written by Phil Zimmermann is a data encryption and decryption program that provides cryptographic privacy and authentication for data. Still isn't the right answer though. Read more here about PGP.
The following reference(s) was used to create this question: To get more info on this topics or any topics of Security+, http://users.telenet.be/d.rijmenants/en/otp.htm and http://en.wikipedia.org/wiki/One-time_pad and http://searchsecurity.techtarget.com/definition/one-time-pad

Explanation/Reference:
Explanation:
The Orange Book defines two types of assurance - operational assurance and life cycle assurance.
Life cycle assurance ensures that a TCB is designed, developed, and maintained with formally controlled standards that enforces protection at each stage in the system's life cycle. Configuration management, which carefully monitors and protects all changes to a system's resources, is a type of life cycle assurance.
The life cycle assurance requirements specified in the Orange Book are as follows:
Security testing

Design specification and testing

Configuration management

Trusted distribution

Incorrect Answers:
B: Operational assurance focuses on the basic features and architecture of a system. An example of an operational assurance would be a feature that separates a security-sensitive code from a user code in a system's memory. Operational assurance is not what is described in the question.
C: Covert timing assurance is not one of the two defined types of assurance.
D: Covert storage assurance is not one of the two defined types of assurance.
References:
Krutz, Ronald L. and Russell Dean Vines, The CISSP Prep Guide: Mastering the CISSP and ISSEP Exams, 2nd Edition, Wiley Publishing, Indianapolis, 2004, pp. 305-306

Section: Communication and Network Security

TCP is a reliable connection-oriented transport for guaranteed delivery of data.
Protocols represent certain rules and regulations that are essential in order to have data communication between two entities. Internet Protocols work in sending and receiving data packets. This type of communication may be either connection-less or connection-oriented.
In a connection-oriented scenario, an acknowledgement is being received by the sender from the receiver in support of a perfect transfer. Transmission Control Protocol or TCP is such a protocol.
On the other hand, UDP or User Datagram Protocol is of the connection-less type where no feedback is being forwarded to the sender after delivery and the data transfer have taken place or not. Though, it's not a guaranteed method, but, once a connection is established, UDP works much faster than TCP as TCP has to rely on a feedback and accordingly, the entire 3-way handshaking takes place.
The following answers are incorrect:
UDP provides for Error Correction, TCP does not: UDP does not provide for error correction, while TCP does.
UDP is useful for longer messages, rather than TCP: UDP is useful for shorter messages due to its connectionless nature.
TCP does not guarantee delivery of data, while UDP does guarantee data delivery: The opposite is true.
References Used for this question:
http://www.cyberciti.biz/faq/key-differences-between-tcp-and-udp-protocols/
http://www.skullbox.net/tcpudp.php
James's TCP-IP FAQ - Understanding Port Numbers.