A bar-code . prefix="o" ns="urn:schemas-microsoft-com:office:office" ?xml:namespace>
A.
can be read by special machines prefix="o" ns="urn:schemas-microsoft-com:office:office"? ?xml:namespace>
B.
represents information prefix="o" ns="urn:schemas-microsoft-com:office:office"? ?xml:namespace>
C.
may be in a pattern of dots prefix="o" ns="urn:schemas-microsoft-com:office:office"? ?xml:namespace>
D.
all of the above are correct prefix="o" ns="urn:schemas-microsoft-com:office:office"? ?xml:namespace>