Option b is correct. It is false that the not operator is a unary operator which must be used in a compound expression.
An array of straightforward expressions connected by arithmetic operators is known as a compound expression. A simple expression that is a part of a compound expression must yield a number.
Any built-in function may be used as an expression (Function Expressions). Some function combinations, however, are unsuitable for compound expressions and are refused. For instance, the LENGTH function shouldn't be used as part of an aggregate function.
A compound expression uses functions and arithmetic operators to specify a combination of simple and compound expressions.
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