Select the correct active voice of the given sentence.
The states of Maharashtra and Gujarat have been alerted about the impending cyclone by NDRF.
1
NDRF has alerted the states of Maharashtra and Gujarat about the impending cyclone.
2
NDRF alerted the states of Maharashtra and Gujarat about the impending cyclone.
3
NDRF was alerting the states of Maharashtra and Gujarat about the impending cyclone.
4
NDRF has been alerting the states of Maharashtra and Gujarat about the impending cyclone.