please help asap

Which of the following formulas for the capital expenditure on intangibles is correct? Assume the current time (now) is t1 and last year is t 0 , and that 'Intangible assets' is a carrying value net of accumulated amortisation. Select one: a. CapExOnIntangibles(t1) = IntangibleAssets (t1)+ IntangibleAssets(t0) + AmortisationExpenseOnlntanglibles(t1) b. CapExOnIntangibles(t1) = IntangibleAssets(t1) - IntangibleAssets(t0) + AmortisationExpenseOnIntanglibles(t1) c. CapExOnIntangibles(t1) = IntangibleAssets(t1) - IntangibleAssets(t0) - AmortisationExpenseOnlntanglibles(t1) d. CapExOnIntangibles(t1) = IntangibleAssets(t1) + AmortisationExpenseOnIntanglibles(t1) e. CapExOnIntangibles(t1) = IntangibleAssets(t 1) AmortisationExpenseOnIntanglibles(t1)