What should come in place of question mark (?) in the following question? (94)2 + (?)2 = (145)2 – (56)2 – 3869

What should come in place of question mark (?) in the following question?

(94)² + (?)² = (145)² – (56)² – 3869
1). 5184
2). 72
3). 84
4). 7056

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