Here's a detailed explanation for each option:
52 × 52 × 52: This is the expanded form of the exponential expression. It shows 52 multiplied by itself three times but does not use exponents.
140608: This is the result of calculating . It is a numerical value, not an exponential expression.
52 × 3: This is a simple multiplication expression, not in exponential form. It shows 52 multiplied by 3, which is unrelated to the concept of exponents.