Which is the first line to not compile? 

A. Line m1

B. Line m2

C. Line m3

D. Line m4

E. None of the above

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interface Building { default Double getHeight () { return 1.0; } // m1 } interface Office { public default String getHeight() { return null; } // m2 } abstract class Tower implements Building, Office {} public class Restaurant extends Tower {} // m3 // m4