Step 1: Recall the Background:
The key words are 'early dated' and 'Mewar'. The earliest dated Mewar Ragamala is from 1605. Find who painted that set, and keep the later artists separate from it.
Step 2: Test every option one by one:
1. Nisardin: the maker of the 1605 Chawand set, the earliest dated one, so this fits the question.
2. Jagat Singh I: a king and patron who ruled later, so he is not a painter at all.
3. Jagannath: a later court painter linked with other manuscripts, so the date does not fit.
4. Sahibdin: his Ragamala is dated 1628, which is later than the early 1605 set, so the date does not fit.
Step 3: Confirm the result:
Only option 1 (Nisardin) passes the test above, and the other three fail for the reasons given. This also agrees with the standard fact: The Chawand Ragamala of 1605 is the early dated Ragamala set from Mewar. It was painted by the artist Nisardin (Nisardi) at Chawand during the rule of Rana Amar Singh I.
Final Answer:
Option 1, Nisardin.
\[\boxed{1}\]