Form 5500 Schedule I Question (Late Contributions)

We have a client that has been chronically late with their contributions in the past few years (all of the interest is being paid in '24).  On Schedule I Question 4a, what would be included:

- Would it be just the contributions for the current year?
- Would it be all contributions for the prior year(s) where interest had not yet been paid?

I believe it's the second one, even though the contributions had been paid in the year.  Since the participants had not yet been made whole, all contributions should be included.  I just wanted to confirm.

Thank you!