Which of the following statements are true?
Answer options
A
The operand in an expression must always be a constant.
B
The operand in an expression must always be a variable.
C
An operand is a mandatory element in an expression.
D
The operand in an expression can be a variable or a constant.
Correct answer: The operand in an expression can be a variable or a constant.
Explanation
An operand in an expression can be a variable, a constant, or a function call — it is not restricted to one type. Option 0 ('always a constant') and option 1 ('always a variable') are false. Option 3 ('can be a variable or a constant') is the correct and complete statement.