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The existence of a(n) _____ entity indicates that its minimum cardinality is zero?
A) ternary
B) optional
C) strong
D) weak

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In the entity-relationship model, a table line compares to an element occurrence. The presence of a compulsory relationship shows that the base cardinality is 0 or 1 for the required element. the presence of a[n] optional entity shows that its base cardinality is zero.An entity-relationship model (or ER model) portrays interrelated things of excitement for a specific zone of data. A crucial ER model is made out of substance types (which portray the things of interest) and decides associations that can exist between components (events of those component types).

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