What does the PHP construct exit return?

Which of the following syslog severity codes indicates an emergency and that the system is unusable?

A. 0 B. 1 C. 6 D. 7

Which of the following statements is false?

a. ToggleGroup method getSelectedToggle returns the Toggle that’s currently selected. Class RadioButton is one of several controls (others are RadioButtonMenuItem and ToggleButton) that implements interface Toggle. b. Each mouse event handler you define must provide one parameter of type MouseEvent. When the event occurs, this parameter contains information about the mouse event, such as its location, whether any mouse buttons were pressed, which node the user interacted with and more. c. Each layout pane has a getChildren method that returns an ObservableList collection containing the layout’s child nodes. d. All JavaFX shapes inherit indirectly from class Shape in the javafx.scene package.