Lucky Feat, The second use on the enemy attacks roll, which one of these statement are true?

@JeremyECrawford #DnD Lucky Feat, The second use on the enemy attacks roll, which one of these statement are true?(A and B)Thanks in advance pic.twitter.com/bH0ciItOFi

— Peter Korntved (@PKorntved) October 25, 2016

Both of these examples are valid uses of the Lucky feat … #DnD https://t.co/lpIVuty2BL

— Jeremy Crawford (@JeremyECrawford) October 25, 2016