Identify the sentence with correct parallel structure.

1. ক
   The CEO is interested not only in expanding the market but also in increasing profits.
2. খ
   The CEO is not only interested in expanding the market but also in increasing profits.
3. গ
   The CEO is interested not only in expanding the market but also to increase profits.
4. ঘ
   The CEO is interested not only expanding the market but also increasing profits.