${?}_{{?}_{{?}_{?}}{?}_i\frac{s}{a}re\text{a}\text{c}\text{o}\text{m}\text{m}\text{o}\text{n}\text{i}\text{n}\text{d}\text{i}\text{c}\text{a}\text{t}\text{o}\text{r}of\text{a}\text{D}\text{o}\text{S}\text{a}\text{t}\text{t}\text{a}\text{c}\text{k}\text{.}}$

Group $of$ answer choices

Unusually light network traffic

Detection $of$ a new virus

User reports $of$ system unavailability

Unknown processes running