Static Indicators are different from variable indicators in which ways? $($choose more than one$)$

Select $3$ correct answer$($s$)$

Question $16$ options:

Variable indicators are derived from a sequence of events for which an attack might occur and identifying where variables exist, static indicators are explicitly defined.

Static indicators are used to express an attack that already has occurred.

Static indicators have known values

Static indicators are expressed as VA$-1,$ VC$-1$ and VB$-1$