What Are QBO Sub-Accounts and How Are These Accounts Added

Multiple Choice

What are QBO Sub-accounts and how are these accounts added to the Chart of Accounts (COA) ?

A) Subcategories of an account that aid in decision making.Add Sub-accounts by selecting New from the COA window,then enter the Category Type,select Detail Type and enter a name.
B) Subcategories of an account used to determine the appropriate tax form.Add Sub-accounts by selecting New from the COA window,then enter the Category Type,select Detail Type and enter a name.
C) Subcategories of an account that aid in decision making.Add Sub-accounts by selecting New from the COA window,next hit the + sign in the upper right corner,then enter the Category Type,select Detail Type and enter a name.
D) Subcategories of an account that aid in decision making.Add Sub-accounts by selecting New from the COA window,then enter the Category Type,select Detail Type and enter a name.Check Sub-account box to confirm the account is a Sub-account.