Explanation:

Let’s break it down:

- Statement I (Concurrent as to pecuniary limit and the subject matter): Courts have concurrent jurisdiction if both have the power to decide the case based on the value involved and what the case is about.

- Statement II (Competency of the former court to be determined as on the date of the ‘former suit’ and not as on the date of the ‘subsequent suit’): When figuring out if a court could hear the earlier case, you look at the court’s capacity on the date that case was filed—not later.

- Statement III (Competency of the trial court determination): It matters whether the trial-level court actually could have heard the earlier case.

- Statement IV (Competence of court when there is a court with preferential jurisdiction): If a case could go to two courts, but one has special status or priority, you go with that one.

- Statement V (Both the suits are in revenue court, but appeals lie to different authorities): Even if two suits are in similar courts, appeal options can split jurisdiction.

Option 4 (All of these) covers all the bases—these are the key rules about concurrent jurisdiction.