Model analysis indicated for 2 quadrants:
Key Concept:
The question wants to ask about the analysis that can be performed in 2 quadrants i.e. in single arch either maxilla or mandible.  
Examples: 

Hixon - old father (mandibular arch)
Peck and peck index (mandibular arch)
Pont's index (maxillary arch)
Hixon-old father
Peck and peck index
Pont's index
All of the above