Which of the following project areas would retrocommissioning aid ? Operational energy efficiency Retrocommissioning is 'a commissioning process that can be performed on existing buildings to identify and recognize system improvements that make the building more suitable for current use.' - USGBC Retrocommissioning usually occurs at least one year after the building has been occupied.,Selecting environmentally preferable products This is not correct.,Identifying system problems prior to occupancy Commissioning (not retrocommissioning) identifies problems before occupancy,Advanced energy metering This is not correct