单选题Given the following script， why does the output come out as an empty line instead of "dog"（）#!/bin/ksh $VAR=dog echo "${VAR}"AThe $VAR variable was not exported.BThe $VAR should have been set as VAR.Cdog needs double quotes around it when setting $VAR.DThe { } should not be around VAR in the echo command.
单选题
Given the following script， why does the output come out as an empty line instead of "dog"（）#!/bin/ksh $VAR=dog echo "${VAR}"
A
The $VAR variable was not exported.
B
The $VAR should have been set as VAR.
C
dog needs double quotes around it when setting $VAR.
D
The { } should not be around VAR in the echo command.
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