Setting the text_wrap component of a ScrolledText widget to _________ en- ables word wrap.

Which of the following are the correct preprocessor commands necessary to prevent multiple inclusions of header files? If there is an answer here that works to prevent multiple inclusion, carefully describe how it works in the explanation.

a) ``` #include “header.h” ``` b) ``` #define HEADER_H #ifndef HEADER_H //declarations for header.h go here #endif ``` c) ``` #ifndef HEADER_H #define HEADER_H // declarations for header.h go here #endif ``` d) ``` #ifndef HEADER_H //declarations for header.h go here #endif ```

Android does not provide a separate testcase class for

1. Service 2. Activity 3. BroadcastReceiver 4. Content Provider