Choose the correct statement:
I. Korvai is a part of the calculations that occurred during the terminal performance of Mridangam.
II. The term 'Taggu' is described as a low-pitched mridangam.
III. Palaghat Mani Iyer is considered a prominent follower of the Pudukottai style of mridangam playing.
IV. 'Karani' is a structural part of Ghatam.
Select the correct option