Certificate signed by Authorised Officers. If the Trustee, in the exercise of its functions, rights, powers and/ or discretions, requires to be satisfied or to have information as to any fact or the expediency of any act, it may call for and accept as sufficient evidence of that fact or the expediency of that act, a certificate signed by any authorised officer of the Issuer as to that fact or to the effect that, in its opinion, that act is expedient and the Trustee need not call for further evidence and will not be responsible for any loss occasioned by relying on or acting on or accepting on such a certificate.