B.
The Planning Board may assign as its agents appropriate Town agencies or officials and may hire professional assistance to review plans and inspect/observe improvements, at the cost of the applicant.
C.
The Board, on its own motion or on the petition of any interested person, shall have the power to modify, amend, or rescind its approval of a plan of a subdivision, or to require a change in a plan as a condition of its retaining the status of an approved plan, in accordance with MGL c. 41, § 81W.