Final answer:
Mary's communication strategy of expressing support and empathy towards Edgar qualifies as a good friend's behavior in this situation.
Step-by-step explanation:
The communication strategy demonstrated by Mary in this situation can be classified as empathy and emotional support. By expressing her willingness to be there for Edgar and offering her support, Mary is showing empathy towards his situation and emotions.
This strategy is an important part of being a good friend as it helps Edgar feel heard and understood. It also encourages open communication and can be a source of comfort during difficult times.
In summary, Mary's communication strategy of expressing support and empathy towards Edgar qualifies as a good friend's behavior in this situation.