Which of the following statements regarding Powers of Attorney in Ontario is true? a. A POA is no longer valid once a witness dies. b. If the POA terms are silent with respect to payment, your attorney is entitled to take payment for their services from your funds at a rate specified by law. c. You can not have more than one POA for property effective at the same time. d. All POAs for property must be registered with the Office of the Public Guardian and Trustee (OPGT)