Who needs to sign the offer to purchase and the closing documents?

An agent has a property for sale that is in a trust. There are two trustees and four beneficiaries. The four beneficiaries include the two trustees. Who needs to sign the offer to purchase and the closing documents? 

The individual(s) who have the authority to bind the trust need to sign the offer to purchase and closing documents. It is most likely the trustee(s) of the trust who would have the legal authority to sign the offer to purchase. However, it is a good idea to provide the trust document to the title company for its review to determine who has the legal authority to sign on behalf of the trust...