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NEW QUESTION: 1
Which three statements about DWDM are true? (Choose three)
A. It allows a single strand of fiber to support bidirectional communications
B. Each channel can carry up to a 1-Gbps signal
C. It is used for long-distance and submarine cable systems
D. It can multiplex up to 256 channels on a single fiber
E. It supports simplex communications over multiple strands of fiber
F. It supports both the SDH and SONET standards
Answer: A,C,F

NEW QUESTION: 2
Which two statements are true regarding constraints?
A. A constraint can be disabled even if the constraint column contains data.
B. A constraint is enforced only for the insert operation on a table.
C. A column with the unique constraint can contain null values.
D. All constraints can be defined at the column level as well as the table level.
E. A foreign key cannot contain null values.
Answer: A,C
Explanation:
B: Any number of rows can include nulls for columns without NOT NULL constraints because nulls are not considered equal to anything.
D: Constraints can be added, dropped, enabled, disabled, or validated. DISABLE allows incoming data, regardless of whether it conforms to the constraint Incorrect:
Not A: The relational model permits the value of foreign keys either to match the referenced primary or unique key value, or be null.
References:

NEW QUESTION: 3





TotalUnitPrice = UnitPrice * (UnitsInStock + UnitsOnOrder)



A. Option B
B. Option A
Answer: A
Explanation:
Explanation
The NULL value in the UnitsOnOrder field would cause a runtime error.