T. J. received this postcard in the mail. Dear T. J.,

Grandpa and I are having a wonderful time in New York City. Yesterday we took a ferry to the Statue of Liberty. As we were eating our lunch near the statue, a seagull swooped down and stole Grandpa's tomato sandwich right out of his hand! We laughed while we watched him gobble the whole thing. We took lots of photos to show you.

Love ya, Buddy!
Grandma

The writer's style is

formal; the writer's purpose is to educate a family member about New York geography.
formal; the writer's purpose is to inform a family member about seagulls and their diet.
informal; the writer's purpose is to entertain a family member with a funny story.
informal; the writer's purpose is to persuade a family member to visit New York.