Accumulation of Income under section 11 (2) Income tax Act - 4 years or 5 years

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In term of accumulation of income of a charitable organization, I have received a different feedback of accumulation years some of my colleagues from South. One said as per latest amendment, NGO can accumulate income only for 3 years if the 85% of income is not spent. Another one said they can accumulate only for 4 years.

I have researched and noted that NGOs having exception under 10 (23C) can accumulate unspent income of 85% for 5 years and if it is not spent by 5 years, the unspent amount is taxable in the 5th year itself. Hence, the safer side they have only 4 years to accumulate. And Noted, this is not the case for other NGOs.

I really need input on this since I could not validate my opinion on this point.

Thanks