When performing regression analysis, what does it mean if R² = 0.84

a. 84% of the variation in the response variable (y) can be explained by the regression model (f(x))

b. 84% of the variation in the regression model (f(x)) can be explained by the response variable (y)

c. This is not a good model

d. The model cannot be used to make predictions

Quality Improvement in Project Management

Please answer correctly.