打开第二个时正确终止活动

有一个主要活动和一个菜单，从中可以调用另外 3 个活动。所有 4 个活动都有代码：

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.menu_main, menu);
    return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    int id = item.getItemId();

    //noinspection SimplifiableIfStatement
    if (id == R.id.action_about) {
        Intent intent = new Intent(this, AboutActivity.class);
        startActivity(intent);
    }

    if (id == R.id.action_add) {
        Intent intent = new Intent(this, ActivityAdd.class);
        startActivity(intent);
    }

    if (id == R.id.action_edit) {
        Intent intent = new Intent(this, ActivityEdit.class);
        startActivity(intent);
    }

    return super.onOptionsItemSelected(item);
}