Click the Exhibit button. Which three statements are true？（）
Given： Which two code fragments， inserted independently at line 13， will compile？（）
Given. Which two statements are true？（）
Given： And MainClass exists in the /apps/com/company/application directory. Assume the CLASSPATH environment variable is set to "." （current directory）. Which two java commands entered at the command line will run MainClass？（）
Given： Which three changes should be made to adapt this class to be used safely by multiple threads？（）
