According to the Industrial Disputes Act, 1947, which one of the following cannot be raised as an industrial dispute by a trade union of workers?

Under the Industrial Disputes Act, 1947, retrenchment refers to:

Under the Industrial Disputes Act, 1947, within which time period from the publication of an Award of an Industrial Dispute to which the Appropriate Government is a party, the Appropriate Government shall make an order rejecting or modifying the Award?