Which of the following is not a correct difference between chordates and non-chordates?

	Character	Chordates	Non-chordates
1	Post-anal tail	Present	Absent
2	Nerve cord	Dorsal and hollow	Ventral and solid
3	Notochord	Present	Absent
4	Heart	Dorsal	Ventral

• A

  1

• B

  2

• C

  3

• D

  4