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in command prompt, it is known that Echo %x1% Shows 4 If it is follow by commands set/a ++x1 Echo %x1% Then the second echo

in command prompt, it is known that

Echo %x1%

Shows 4

If it is follow by commands set/a ++x1

Echo %x1%

Then the second echo command show ____

a. 3

b. 6

c. 4

d. 5

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