The principal on a construction project becomes concerned that the contractor has not effected insurance of the works as required in accordance with clause 16 of the AS 4000 contract. The principal makes a written request to the contractor to provide satisfactory evidence of insurance, but the contractor fails to do so. Which of the following is now permitted under the AS 4000 contract?
a. The principal may effect insurance of the works
b. If the principal effects insurance of the works, the cost to the principal of effecting insurance of the works shall be certified by the superintendent as money payable from the contractor to the principal
c. The principal may refuse payment to the contractor until evidence of insurance of the works is produced by the contractor
d. All of the above