In order to be considered interest for tax purposes, IT Folio S$3-$F$6-$C$1$ indicates that the amount has to satisfy three criteria, EXCEPT which of the following:

a$.$

It must be calculated on a principal sum or the right to a principal sum.

b$.$

It must be calculated based on the future value of the principal.

c$.$

It must be calculated on a day$-$to$-$day accrual basis.

d$.$

It must be compensation for the use of the principal sum or the right to the principal sum.