Explanation:

- Malik Ambar was indeed an influential figure in the Deccan region.

- He was known for his resistance against Mughal expansion in the south.

- His administrative skills significantly benefited the state he served.

Here's a quick analysis of the options:

- Option 1: Bidar

- Part of the Deccan Sultanates, but Malik Ambar wasn't its administrator.

- Option 2: Bijapur

- Another Deccan Sultanate, but not where Malik Ambar served.

- Option 3: Golconda

- Also a significant Deccan Sultanate, but not under Malik Ambar's administration.

- Option 4: Ahmednagar

- Correct! Malik Ambar was the regent of the Ahmednagar Sultanate.

- He played a crucial role in maintaining its independence against the Mughals.