For which kind of blocked invoices can they use the automatic release function?

In your company, the invoice verification clerks are working with the Release Blocked Invoices app.

For which kind of blocked invoices can they use the automatic release function? Please choose the correct answer.
A . Invoices blocked manually
B . Invoices blocked because of an excessive amount
C . Invoices blocked stochastically
D . Invoices blocked due to variances

Answer: D