निम्नलिखित में से कौन सा समूह बिहार के उन तीन जिलों की सही पहचान करता है जो पश्चिम बंगाल के साथ राज्य की पूर्वी सीमा साझा करते हैं?

Which of the following districts is located in the westernmost part of Bihar?

Consider the following statements regarding the state of irrigation in Bihar: I. Approximately 60% of the net sown area in the state is irrigated. II. The primary sources of irrigation in Bihar are strictly limited to canals and tube wells. III. Major irrigation projects operational in the state include the Sone Canal System, Kosi Project, and Gandak Project. IV. South Bihar is more dependent on irrigation due to lesser rainfall compared to the flood-prone North Bihar region. Which of the statements given above are correct?