With reference to the price paid by her department for the recent upgrading of the Beitbridge border post fence, the quotation of which was based on a 2016 pricing which was amortised to bring it in line with 2020 pricing, (a) how did the contractor cover the additional security required during the construction, which was substantial and not originally costed into the quote, without changing the cost price and (b) what were the details of the mitigating factors for the high cost of the upgrading of the specified fence in the 2016 quote, when the cost of the construction was justified in part on the basis that it was a fast-track job which required additional workers and plant hire to meet the time frame?