Consider the following statement (s).
I. Al Masudi was an Arab explorer from Baghdad, gave an account of the reversal of ocean currents and the monsoon winds over the north Indian plains.
II. Edmund Halley in 1686 explained that the monsoon is the resultant of the thermal contrasts between continents and ocean due to the their differential heating.
Which of the above statement (s) is/are correct about the mechanism of monsoon?