Explanation:

1 and 2 only

Sher Shah Suri: Sher Shah Suri lives during the time of Guru Nanak. They were contemporaries.

Shankar Deva: Shankar Deva was a 15th-16th century Assamese saint-scholar and the founder of the Bhakti movement in Assam. He and Guru Nanak were contemporaries.

Ramanuja: Ramanuja, the 11th-century philosopher and theologian, lived much earlier than Guru Nanak, so they were not contemporaries.

Therefore, the correct answer is that Guru Nanak was a contemporary of Shankar Deva.