問題文
A brand's deliverability is suffering from invalid addresses and low engagement. It is deciding between single opt-in and double opt-in for new sign-ups. Which choice best protects list quality, accepting slightly slower growth?
選択肢
- Buy a list to replace the current subscribers
- Remove the sign-up form entirely to stop new sign-ups
- Double opt-in, because confirming the address filters out invalid and unintended sign-ups
- Single opt-in, because maximizing raw sign-up count is always most important, which the scenario is expected to accept without any further checks