Understanding the Relationship Between Alice and Bob

The following passage describes the relationship between two characters in a short story:

Alice and Bob are best friends who have always supported each other through difficult times. Alice often encourages Bob when he feels insecure about his abilities, reminding him of his past achievements. In return, Bob listens to Alice's problems and offers thoughtful advice. Their bond strengthens as they navigate challenges together, emphasizing the importance of friendship.

Based on the passage, which statement best describes the relationship between Alice and Bob?