topic= regression model

what do u do when a number of independent variables are found to have a high correlation (>70%)=

a. The independent variable that has the least relationship with the dependent variable must be removed from the model first.

b.all of such independent variables must be removed at once, before generating a regression output.

c.The independent variable that has the least relationship with the dependent variable must be removed from the model last.

d.all of such independent variables must be removed at once, after generating a regression output.