How does Front Man know specifically to speak to the intruder in Korean when he notices the receiver is on backwards?
a. Front Man has camera footage of the intruder speaking Korean before entering
b. Front Man hears the intruder speaking Korean before noticing the receiver is on backwards
c. Front Man has a translator app on his phone that detects the intruder's language automatically
d. Front Man has prior knowledge of the intruder's identity and language proficiency