Remi is studying employee performance at his company. Given the fact that the company only has 20 employees, he is concerned that his regression models might be experiencing overfitting. Which of the following symptoms might confirm his suspicions? options:
a. Very high multiple-R2 value near 1.0,
b. Highly significant p-values for the β slopes
c. Much higher residual error on training sets vs test sets
d. Much higher residual error on test sets vs training sets
e. Extremely accurate predictions on test sets
