What relationship exists when a primary key may appear many times as a foreign key, and a foreign key must appear once and only once as a primary key?
A. 1:1
B. 1:M
C. M:M
D. M:1
B. 1:M
When you drag and drop a primary key onto a foreign key, Microsoft Access assumes that the relationship is one-to-many (1:M). That is, a primary key may appear many times as a foreign key, and a foreign key must appear once and only once as a primary key.
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