Answer: Account and Settings > Advanced > Automation
Explanation:
The options are:
a. Account and Settings > Sales > Products and Services
b. Account and Settings > Expenses > Messages
c. Account and Settings > Advanced > Automation
d. Account and Settings > Advanced > Accounting
For a QuickBooks Online user to be able to apply a Credit Memo transaction automatically to the invoice of a customer, it should be noted that one can turn the apply credits checkbox automatically in Account and setting > advanced> automation.
One should first click on Account and settings, after which the Advanced tab will be clicked on. Then, one will select automation. Finally, one will click on apply credits automatically.