Transferable amount of Personal allowance

Hello,

As per lecture notes pg 11 regarding marriage allowance,

“The election must be made within 4 years of the end of the tax year to which it should apply though if made within the tax year concerned the election will remain in force for future years until it is either withdrawn or the conditions are not met”.

Does this mean

1- a person has to elect his/her spouse to transfer the unused allowance every time if he/she doesn’t make the election in the concerned tax year?

2- If the person makes the election in the concerned tax year then there is no need to re-elect and the election will continue to last even after the concerned tax year unless withdrawn?

Thanks & regards,
AB