Justyna and Annie are best friends. Justyna earns an allowance every Friday. Annie earns an allowance after every third time she cleans her room. Justyna is on a $\_\_\_\_\_\_\_\_\_\_\_\_\_$ schedule of reinforcement and Annie is on a $\_\_\_\_\_\_\_\_\_\_\_\_\_\_$ schedule of reinforcement.

Group of answer choices

fixed interval; fixed ratio

variable ratio; variable interval

fixed ratio; fixed interval

fixed ratio; variable interval