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To find 5² × 5⁷,we apply the following law of exponent,
aᵐ × a ⁿ = aᵐ⁺ⁿ.
So, the given expression can be written as,
5² × 5⁷ = 5²⁺⁷.
Hence, 5² × 5⁷ = 5²⁺⁷.
Therefore, option (d) is correct.