(1) The period of validity of a tender is a period not exceeding 180 days commencing from the deadline for submission of the tender.
(2) The period of validity of a tender may be extended only with the agreement of the tenderer.
(3) A tenderer who agrees to an extension of the validity period of his or her tender shall furnish a corresponding extension of his or her tender security, if security was required for the original submission of the tender.