Which of the Following Statements Correctly Specifies the Use of Lambda

Multiple Choice

Which of the following statements correctly specifies the use of lambda expressions and the comparing method of the Comparator functional interface to sort an array of countries by population, assuming the existence of a getPopulation method?

A) Arrays.sort(countries, Comparator.comparing(c1 -> c1.getPopulation() , c2 -> c2.getPopulation() ) ;
B) Arrays.sort(countries, comparing(c -> c.getPopulation() ) ) ;
C) Arrays.sort(countries, c -> c.getPopulation() ) ;
D) Arrays.sort(countries, Comparator.comparing(c -> c.getPopulation() ) ;