Realization of logic functions with the help of universal gates NAND and NOR Gate

In Boolean algebra, the bar sign (-) indicates ………………..
The output of an AND gate with three inputs, A, B, and C, is HIGH when ________.
If a 3-input NOR gate has eight input possibilities, how many of those possibilities will result in a HIGH output?
Which of the following logical operations is represented by the + sign in Boolean algebra?
Which of the following equations would accurately describe a four-input OR gate when A = 1, B = 1, C = 0, and D = 0?