A perpetual injunction is a final order of the court that permanently restrains a party from doing a certain act. The grounds for granting a perpetual injunction are laid down in Section 38 of the Specific Relief Act, 1963. According to Section 38(3), a perpetual injunction may be granted in several situations where monetary compensation would not be adequate. These include:
(a) Where the defendant is a trustee of the property for the plaintiff.
(b) Where there exists no standard for ascertaining the actual damage caused, or likely to be caused, by the invasion.
(c) Where the invasion is such that compensation in money would not afford adequate relief.
Since all the listed options are specified grounds in the Act, the correct answer is "All of the above."