Question: When you copy a smaller value into a larger destination using Zero Extenstion ( ZX ) , what happens to the upper half of

When you copy a smaller value into a larger destination using "Zero Extenstion (ZX)", what happens to the upper half of the destination?
Fills the upper half with ones
Fills the upper half with the leading bit
Fills the upper half with zeros
Fills the upper half with source operand
Fills everything with ones

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