Which of the following is a way to determine how much memory to install in a computer?

Accessing an open wireless connection and exploiting vulnerabilities on a server are some of the activities that take place in the following step of the attacker's methodology

a. Reconnaissance b. Scanning and enumeration c. Gaining access d. Escalation of privilege

?Which of the following is true about global variables?

A. ?They are declared using the global keyword B. ?The are declared outside of any functions C. ?Their lifetime begins the first time they are used D. ?They are declared right before the opening brace in main