A security analyst was monitoring the networks of a group of companies. The analyst identified several periods of concentrated, coordinated activity by unknown actors. The activity repeated at regular

A security analyst was monitoring the networks of a group of companies. The analyst identified several periods of concentrated, coordinated activity by unknown actors. The activity repeated at regular intervals and affected all the companies. Minor hardware outages that correlated with the same times as the discovered activity escalated in severity. Which of the following threat actors was most likely involved?