Mobile app development

Which of the following would be valid code in android to retrieve a message from another Activity: Select one: O a. String message = intent.getExtra("message"); b. String message = intent.getStringExtra("message"); C. String message = intent.getExtra(); d. String message = intent.getStringExtra(); Which of the following would be valid code to create an Intent: Select one: O a. Intent intent = new Intent(); b. Intent intent = new Intent(Target.class); c. Intent intent = new Intent(this, Target.class); O d. Intent intent = new Intent(this)