Addition of HBr to propene in presence of peroxide (anti Markovnikov’s addition) occurs when

$\stackrel{\odot }{\text{Br}}$ first adds to propene

${\text{H}}^{+}$  first adds to propene

$\stackrel{\oplus }{\text{Br}}$ first adds to propene

$\stackrel{•}{\text{Br}}$ first adds to propene