What's wrong with this text attribute?

AVD stands for: 

Whenever ‘implements’ is used in java class, it must be underlined with error and methods must be added to fix the error. 

Which app has these features? 

• Connection with server (bi-directional information transmission) 

• User-friendly interface 

• Security and authentication consideration 

• Regular updates to eliminate security holes. 

Debug mode break point allows the program to stop anywhere in MainActivity.java. 

Developing AR games is impossible because AR technology is proprietary nowadays. 

Log.i message can be seen via Android emulator. 

Setting alpha = 0 means setting visibility = GONE. 

Suppose an Android Studio project is about customized listview showing four seasons with delete feature, the following is listview item xml. Which of the following is optional in xml?