Which of the following cities of Uttar Pradesh is/are covered under the 'Heritage City Development and Augmentation Yojana (HRIDAY)'? 1. Varanasi 2. Mathura 3. Prayagraj 4. Ayodhya Select the correct answer from the codes given below. Codes: (a) 1 only (b) 3 only (c) 1 and 2 (d) 1, 2, 3 and 4