Which edge case matters for this problem?

Question

Which edge case matters for this problem?

Option A — Correct answer

If gcd(a,m) is not 1, return -1.

Option B

Whether intervals overlap

Option C

Whether a linked list has a cycle

Option D

Whether a queue is empty

Explanation

If gcd(a,m) is not 1, return -1.

Modular Inverse - Extended Euclid Pattern Practice Quiz