Microprocessor
The data bus of any microprocessor is always

 None
 Either unidirectional or bi-directional
 Unidirectional
 Bi-directional

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Microprocessor
In a vector interrupt

 the branch address is obtained from a register in the processor.
 the interrupting source supplies the branch information to the processor through an interrupt vector.
 the branch address is assigned to a fixed location in memory.
 none.

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