Assume you have a training dataset of 50 observations and want to perform 5-fold cross-validation, what is the best way to split the data?

a.Training Set -30 observations

Cross-Validation Set -10 observations

Test Set -10 observations

b. Training and Cross-Validation Set35 observations

Test Set15 observations

c. Training and Test Set35 observations

Cross-Validation set15 observations

d. Training Set35 observations

Cross-Validation and Test Set15 observations