Identify the correct sentence using a colon.

1. ক
   He bought: apples, oranges, and bananas.
   
2. খ
   He bought apples: oranges, and bananas.
   
3. গ
   He bought the following fruits: apples, oranges, and bananas.
   
4. ঘ
   He: bought apples, oranges, and bananas.