ABA Designs Alex Uses a Small N Design to Train

Multiple Choice

ABA Designs Alex uses a small N design to train his Newfoundland dog Boatswain to stop chasing the neighbor's cat.Each condition lasts for one week.
Week 1: Alex measures how often Boatswain chases the cat.
Week 2: Alex squirts Boatswain with a water bottle whenever he chases
The cat.
Week 3: Alex measures how often Boatswain chases the cat.
Week 4: Alex squirts Boatswain with a water bottle whenever he chases
The cat.
Which design is this?

A) AB
B) ABA
C) ABAB
D) ABABA