Which of the following symbols is used to indicate a visibility/access modifier which is visible to everyone in UML class diagram? O a. None of the other answers Ob # O c. + d. Which of the following could be used for creating GUI-based applications? O a JavaFX b. The Java package javax.swing O c. The Java package java.awt O d. All of the other answers 1 + "2" + 1*2 What is the result value of the above expression? O a. None of the other answers Ob. "1212" O c. 1212 O d. "122" Which of the following is used as the default layout manager of a JPanel in Java? O a. Grid Layout O b. FlowLayout O c. All of the other answers O d. BorderLayout