Section: Protection of Information Assets
Explanation:
Forward error control involves transmitting additional redundant information with each character or frame to facilitate detection and correction of errors, in feedback error control, only enough additional information is transmitted so the receiver can identify that an error has occurred.
Choices B and D are both error detection methods but not error correction methods. Block sum check is an extension of parity check wherein an additional set of parity bits is computed for a block of characters. A cyclic redundancy check is a technique wherein a single set of check digits is generated, based on the contents of the frame, for each frame transmitted.

Section: Protection of Information Assets
Explanation:
Properly planned risk-based audit programs shall increase audit efficiency and effectiveness. The
sophistication and formality of this kind of audit do vary a lot depending on the target's size and complexity.

Explanation/Reference:
Explanation:
Public key (asymmetric) cryptographic systems require larger keys (1,024 bits) and involve intensive and time-consuming computations. In comparison, symmetric encryption is considerably faster, yet relies on the security of the process for exchanging the secret key. To enjoy the benefits of both systems, a symmetric session key is exchanged using public key methods, after which it serves as the secret key for encrypting/decrypting messages sent between two parties.

The use of statistical sampling procedures helps minimize detection risk.

Section: Protection of Information Assets