Explanation/Reference:
Explanation:
A lattice is a mathematical construct that is built upon the notion of a group. The most common definition of the lattice model is "a structure consisting of a finite partially ordered set together with least upper and greatest lower bound operators on the set."
Two methods are commonly used for applying mandatory access control:
Rule-based (or label-based) access control: This type of control further defines specific conditions for

access to a requested object. A Mandatory Access Control system implements a simple form of rule- based access control to determine whether access should be granted or denied by matching:
- An object's sensitivity label
- A subject's sensitivity label
Lattice-based access control: These can be used for complex access control decisions involving

multiple objects and/or subjects. A lattice model is a mathematical structure that defines greatest lower- bound and least upper-bound values for a pair of elements, such as a subject and an object.
Incorrect Answers:
B: The subject's upper bound must be equal or higher, not lower than the upper bound of the object being accessed.
C: The subject must have an upper bound.
D: The subject must have access rights determined by an upper bound.
References:
Harris, Shon, All In One CISSP Exam Guide, 6th Edition, McGraw-Hill, 2013, p. 381
https://en.wikipedia.org/wiki/Computer_access_control
http://en.wikipedia.org/wiki/Lattice-based_access_control

Explanation

SPAM - The term describing unwanted email, newsgroup, or discussion forum messages. Spam can be innocuous as an advertisement from a well-meaning vendor or as malignant as floods or unrequested messages with viruses or Trojan horses attached SYN Flood Attack - A type of DoS. A Syn flood attack is waged by not sending the final ACK packet, which breaks the standard three-way handshake used by TCP/IP to initiate communication sessions. Ping of death attack - A type of DoS. A ping of death attack employs an oversized ping packet. Using special tools, an attacker can send numerous oversized ping packets to a victim. In many cases, when the victimized system attempts to process the packets, an error occurs causing the system to freeze, crash, or reboot. Macro Viruses - A virus that utilizes crude technologies to infect documents created in the Microsoft Word environment.
-Ed Tittle CISSP Study Guide (sybex) pg 550 740, 743, 723, 713