What should be the first step which the Superintendent takes under the contract with respect to the three balconies are in the process of being tiled without the specified waterproofing membranes?
a. Issue a direction to the Contractor to remove the tiles on the three balconies and apply the waterproofing membrane stating a date for commencement and completion
b. Issue a written notice to the Contractor that if the three balconies have not been rectified within 8 days, the Principal intends to have the balconies rectified by others
c. Notify the Contractor that the Principal intends to have recourse to the security
d. Give the Contractor as soon as practicable written details of the defective waterproofing to the three balconies