Dan is a resident of Seattle.He had his attorney write up a Will for him, giving everything to his sister Maria, if anything happened to him on one of his mountain-climbing trips.Dan signed the form at home, then mailed it to Maria at her home in Spokane, Washington, with instructions for her to get a couple of her neighbors to sign the form as witnesses of Dan's signature.Maria had a couple of her neighbors come over for coffee, and they signed the form as Maria had asked.The neighbors have never met Dan.Maria wants to make sure the Will is valid under Washington law - what is your conclusion?