A, B, and C are three distinct single-digit positive numbers. If the units digit of A^2, B^2 and C^2 are distinct

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A, B, and C are three distinct single-digit positive numbers. If the units digit of A^2, B^2, and C^2 are distinct perfect squares, then what is the number of possible values of (A, B, C)?

A. 4
B. 8
C. 20
D. 48
E. 120

OA D