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Consider a software program that is artificially seeded with $100$ faults. While testing this program, $159$ faults are detected, out of which $75$ faults are from those artificially seeded faults. Assuming that both real and seeded faults are of same nature and have same distribution, the estimated number of undetected real faults is _____________.

1. $28$
2. $175$
3. $56$
4. $84$

option A