What level of logging is enabled on a Router where the following logs are seen?

%LINK-3-UPDOWN: Interface Serial0/0, changed state to up
%LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/0, changed state to up

A.
These two log messages will not have a severity level. They are not errors but are just informational messages.

B.
The first log message is categorized as a warning message.

C.
These messages regarding interface status are normal output and will always be displayed when you exit config mode.

D.
The first log message is an error message with a severity level of 3.

E.
The second message would be shown if the logging consol warning command had been issued.