Read the following passage and find out the inference stated through passage.
The announcement for the closure of Mumbai International Airport has been made on 24th February. The airport is believed to be closed for two weeks from 5th April to 19th April. The current runway length is short for operating wide-bodied aircrafts and so to enable the operation of such aircrafts, the airport will be closed for definite time.
Which of the following statements can be inferred from above passage?
1
Staff of the airport is on strike due to which no flight will be operated.
2
The airport authorities have been threatened with hijacking of one of their own airplanes in near future by some criminal organisation.
3
Airport authority will carry out runway upgrade work.
4
With the Republic day near, the airport authorities are concerned with the safety of its passengers.