All principals must certify and sign the certificate personally as to their individual record and are responsible for its timely filing with the HUD Area Office in whose jurisdiction the project or proposal is located except:
(a) When a corporation is a principal all its officers, directors and principal stockholders need not individually sign, certify nor file the certificate when they all have the same record. When their previous participation records are the same the officer authorized to sign for the corporation will list on the certificate the full names for all such principals connected with the corporation who do not elect to sign. Those principals who have a separate participation record outside that of their corporation must certify, sign and file. The objective is full disclosure.
(b) The Participation Control Officer is authorized to waive the requirement for signatures for good cause in cases where he finds that adequate provision has been made for full disclosure, and the signature is thereafter provided.