ECO-House Bargaining Case

(House Bargaining)
You've entered into a contract to purchase a new house, and the closing is scheduled for next week. It's typical for some last minute bargaining to occur at the closing table, where sellers often try to tack on extra fees. You have three options for the closing: (1) attend yourself, (2) send an attorney authorized to close only per the previously negotiated terms, or (3) pre-sign all the closing documents per the current terms and not attend the closing. Discuss which one of these would be most advantageous from a bargaining position?