Let n be a four-digit integer in which all the digits are different. If x is number of odd integers and .y is number of even integers, then

• A

  $\mathrm{x}<\mathrm{y}$

• B

  $\mathrm{x}>\mathrm{y}$

• C

  $\mathrm{x}+\mathrm{y}=4500$

• D

  $|\mathrm{x}-\mathrm{y}|=54$