In QBO,account Numbers Are

In QBO,account numbers are:

A) used to uniquely identify specific accounts but do not assist in identifying an account type i.e.asset,liability,revenue,expense,and equity.
B) used to only identify an account type and the account name identifies the specific account.
C) used to uniquely identify accounts and help identify an account type.
D) a combination of being randomly assigned and assigned alphabetically buy the user of QBO.