In the following question, a sentence has been given in Active/Passive Voice. Out of the four alternatives suggested, select the one which best expresses the same sentence in Passive/Active Voice. Had work been resumed by the labourers before the manager arrived?

• Have the labourers resumed work before the arrival of the manager?
• Had the labourers resumed work before the manager arrived?
• Had they resumed the work before the manager came?
• Had the labourers not resumed work before the manager arrived?