17. M signed a blank check which he inadvertently left in his desk at his ofce. P later stole the same, who lled in the amount of P 20,000.00 and a ctitious name as payee. P then indorsed the check in the payee's name and indorsed the check to A; thereafter, A indorsed to B; then B to C, and C to D. a. D cannot enforce the instrument against M only if D is holder in due course b. D can enforce the instrument against M even if D is not a holder in due course because the signature of D is genuine c. D cannot enforce the instrument against any one of the prior parties because the instrument is not a valid instrument and therefore, not negotiable d. D can enforce the instrument against any one of the prior parties except M