单项选择题
A.null
B.zero
C.some
D.Compilation fails.
E.An exception is thrown at runtime.
多项选择题 Which two statements are true？（）
单项选择题 What is the result when the programmer attempts to compile the code and run it with the command java Converter 12？（）
多项选择题 and the command line： java -Dprop.custom=gobstopper Commander Which two， placed on line 13， will produce the output gobstopper？（）
