Which logical operator does not allow us to combine two or more conditions?

The correct answer is C. NOT.

A logical operator is a mathematical symbol used to combine two or more logical expressions. The four basic logical operators are AND, OR, NOT, and NAND.

• AND is a binary operator that returns true only if both of its operands are true.
• OR is a binary operator that returns true if either of its operands is true.
• NOT is a unary operator that returns the negation of its operand.
• NAND is a binary operator that returns true if both of its operands are false.

In the question, we are asked which logical operator does not allow us to combine two or more conditions. The answer is NOT, because NOT only takes one operand and returns the negation of that operand. AND, OR, and NAND can all take two or more operands and return a true or false value.