What is the ordering of numbers in the Three Point estimate of Estimated Cost At Completion $($EAC$)?$ The abbreviations used are BAC for Budgeted cost At Completion; CPI for Cost Performance Index and SPI for Schedule Performance Index $($SPI$).$

$1.$

Always $($BAC$,$ CPI forecast, CPI SPI forecast$)$

$2.$

Always $($worst case scenario, Budgeted cost At Completion, best case scenario$)$

$3.$

Always $($CPI SPI forecast, CPI forecast, BAC$)$

$4.$

Always $($CPI forecast, BAC, CPI SPI forecast$)$

$5.$

The numerical order of the BAC, CPI forecast and CPI SPI forecast