As per the Central Vigilance Commission Act if the Commission decides to proceed to investigate a complaint under section 8A(1)(a), what steps does it take regarding the investigation?

Section 8B. Action on investigation in relation to public servants--(1) In case the Commission decides to proceed to investigate into the complaint under clause (a) of sub-section (1) of section 8A, it shall direct any agency (including the Delhi Special Police Establishment) to carry out the investigation as expeditiously as possible and complete the investigation within a period of six months from the date of its order and submit the investigation report containing its findings to the Commission: Provided that the Commission may extend the said period by a further period of six months for the reasons to be recorded in writing.