How is the association between the two use cases shown?

A use case Place Order must always invoke a related use case Check Credit.
How is the association between the two use cases shown?
A. By a solid line with no arrowhead or stereotype.
B. By a broken, arrowed line stereotyped with the word <<extend>>.
C. By a broken, arrowed line stereotyped with the word <<exclude>>
D. By a broken, arrowed line stereotyped with the word <<include>>.

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