Option 1 suggests that only statement III is true, indicating both schemes are withdrawn, which is incorrect. The schemes have different statuses; Scheme `A` was withdrawn while scheme `B` remains.

Option 2 implies that only statements I and II are correct, that RBI bears exchange rate fluctuations for scheme `A` and other banks meet the exchange rate difference for scheme `B`. This option misses the status of the schemes, specifically that scheme `A` has been withdrawn.

Option 3 supports statements I, II, and III, signifying that both schemes were withdrawn, which again is not correct. It`s only scheme `A` that was withdrawn, not scheme `B`.

Option 4, which is the correct answer, supports all statements except III, telling us that scheme `A` is no longer in effect and scheme `B` is now responsible for managing exchange rate differences. This is indeed the correct status of the FCNR-`A` and FCNR-`B` schemes.