(1) Except as otherwise provided in subsection (d) of this section and in section
1103 (a)(1) and (2) of this title, if the assets of a plan are held by two or more trustees
(A) each shall use reasonable care to prevent a co-trustee from committing a breach; and
(B) they shall jointly manage and control the assets of the plan, except that nothing in this subparagraph (B) shall preclude any agreement, authorized by the trust instrument, allocating specific responsibilities, obligations, or duties among trustees, in which event a trustee to whom certain responsibilities, obligations, or duties have not been allocated shall not be liable by reason of this subparagraph (B) either individually or as a trustee for any loss resulting to the plan arising from the acts or omissions on the part of another trustee to whom such responsibilities, obligations, or duties have been allocated.
(3)
(A) In the case of a plan the assets of which are held in more than one trust, a trustee shall not be liable under paragraph (1) except with respect to an act or omission of a trustee of a trust of which he is a trustee.
(B) No trustee shall be liable under this subsection for following instructions referred to in section
1103 (a)(1) of this title.