Explanation/Reference:
Explanation:
The primary key is the attribute that is used to make each row or tuple in a table unique.
Incorrect Answers:
B: Candidate keys are a subset of attributes that from which the database developer can choose the primary key to uniquely identify any tuple or record in a table.
C: A foreign key is an attribute in one table that matches the primary key of another table and is used to cross-reference tables.
D: Secondary keys are candidate keys that have not been chosen as the primary key. The primary key is the attribute that is used to make each row or tuple in a table unique. Candidate keys are a subset of attributes that from which the database developer can choose the primary key.
References:
Harris, Shon, All In One CISSP Exam Guide, 6th Edition, McGraw-Hill, New York, 2013, pp. 1174, 1179-
1180
Stewart, James, Ed Tittel and Mike Chapple, CISSP: Certified Information Systems security Professional Study Guide, 5th Edition, Wiley Publishing, Indianapolis, 2011, pp. 276, 312
http://databases.about.com/cs/specificproducts/g/candidate.htm
http://rdbms.opengrass.net/2_Database Design/2.1_TermsOfReference/2.1.2_Keys.html

Section: Security and Risk Management

Explanation
Section: Security Assessment and Testing

To maintain operational assurance, organizations use two basic methods: system audits and monitoring. Monitoring refers to an ongoing activity whereas audits are one-time or periodic events and can be either internal or external. The essential difference between a self-audit and an independent audit is objectivity, thus indirectly affecting the results of the audit. Internal and external auditors should have the same level of competence and can use the same tools.
Source: SWANSON, Marianne & GUTTMAN, Barbara, National Institute of Standards and Technology (NIST), NIST Special Publication 800-14, Generally Accepted Principles and Practices for Securing Information Technology Systems, September 1996 (page 25).