In the following question, a sentence has been given in Active/Passive voice. Out of four alternatives suggested, select the one, which best expresses the same sentence in Passive/Active voice. The seawater eventually corroded the pillars of the bridge.

• Eventually the pillars of the bridge are being corroded by the seawater.
• Eventually the pillars of the bridge have been corroded by the seawater.
• The pillars of the bridge were eventually corroded by the seawater.
• The pillars of the bridge have been eventually corroded by the seawater.