The figure given below shows the head region of a cockroach. Identify $A$ to $D$.

• A
  $A$-Maxilla,$B$-Mandible,$C$-Labium,$D$-Labrum
• B
  $A$-Labium,$B$-Maxilla,$C$-Labrum,$D$-Mandible
• C
  $A$-Mandible,$B$-Maxilla,$C$-Labium,$D$-Labrum
• D
  $A$-Labium,$B$-Labrum,$C$-Maxilla,$D$-Mandible