Which kind of design asks (1) if the problem exists at different ...

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Which kind of design asks (1) if the problem exists at different levels over time, and (2), if the problem is changing by itself?
 
  a. A design
  b. B design
  c. AB design
  d. BB design

Question 2

Another name for case-level design is:
 
  a. Goal attainment scaling
  b. Problem solving design
  c. Single-subject design
  d. Test-retest design

[daiying98]

Answer to Question 1

A

Answer to Question 2

C

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Thanks for the timely response, appreciate it

[Liamb2179]

Gracias!