Which of the following statements is correct about Humayun?

a- Nasiruddin Humayun expanded the frontiers of the Mughal empire but lost it to the Safavid ruler of Iran.

b- In 1555 Humayun defeated the Safavid rulers to regain the empire, but died a year later

Neither of them is correct.

Babur's successor, Nasiruddin Humayun (1530-40, 1555-56) expanded the frontiers of the empire, but lost it to the Afghan leader Sher Shah Sur, who drove him into exile. Humayun took refuge in the court of the Safavid ruler of Iran. In 1555 Humayun defeated the Surs, but died a year later