Question about application of funds in trust

If such accumulation of income is in excess of 15% of income then it can be deemed to have been applied for the charitable/religious purpose provided

A Notice should be given in the form of Form no. 10 to the assessing officer about the purpose and period(can not exceed 5 yrs) on or before the due date specified under sec 139(1) for the previous year

And the above accumulation has been invested in the manner/mode prescribed in sec 11(5)(that includes deposit with public sector company)/scheduled banks)