Read part of a letter.

Zach,

I hope you will consider joining our soccer team this fall. The boys enjoyed playing with you during camp, and we could use your skills at goalie. We have skills clinic next Saturday at Express Park. Come by between 9:00 and noon, and I can answer any questions you might have.

What describes the type and purpose of this letter?

It is a friendly letter written to offer an invitation.
It is a persuasive letter written to change a policy.
It is a friendly letter written to express thanks.
It is a business letter written to request feedback.