What is the remainder when 32^(32)^(32) . . . . .

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What is the remainder when 32^(32)^(32) is divided by 7?

A. 5
B. 4
C. 2
D. 0
E. 1

The OA is the option B.

How can I know which of the numbers is the remainder? Is there an easy way? Experts, may you help me?