Question: You want to open the default Dialer app on a device. What is wrong with this code?

1. `startActivityWithResult()` should be used instead of `startActivity()` when using `Intent.ACTION_DIAL`.
2. For `Intent.ACTION_DIAL`, the `Intent` option `Intent.FLAG_ACTIVITY_NEW_TASK` must be added when using this `dialerIntent`.
3. The `dialerIntent` will cause an ActivityNotFoundException to be thrown on devices that do not support `Intent.ACTION_DIAL`.
4. The permission `android.permission.CALL_PHONE` must be requested first before `Intent.ACTION_DIAL` can be used.

Answer: The correct answer of the above question is Option A:`startActivityWithResult()` should be used instead of `startActivity()` when using `Intent.ACTION_DIAL`.