Which of the following is one of the prime functions of the doctrine of judicial review ?

One of the two prime functions of the doctrine of judicial review is To protect the constitution against any undue encroachments by the government (the other being to legitimise government action that conforms to the constitution). Rather than de-legitimising valid governance, encroaching upon judicial powers, or undermining the rule of law, judicial review upholds constitutional supremacy and the rule of law by keeping legislative and executive organs within their constitutional limits.