Kevin failed 4 times. Can you open the answer key?

Mrs. Patel locked tomorrow's answer key. Kevin, who "definitely did the homework", has already tried 4 codes:

1) 123 (his password for everything)
Nothing is correct.

2) 007 (his homework was "classified")
One digit is correct and well placed.

3) 246 (the school bus that "ate his homework")
One digit is correct but in the wrong place.

4) 144 (a gross, like his locker)
Two digits are correct: one well placed, one in the wrong place.

Crack the 3-digit code before the bell rings. 🔔