I don't understand task 2

I still don't understand :/

Here is the exact question: The tabs are stored in an array named tabBarItems (line 9). Declare a UITabBarItem variable named tab and set it from tabBarItems. Use the selectedIndex we just set as the index for the tab you get from the tabBarItems array.

I'm not sure how better to explain it... Here's the correct answer for task 2:

#import "MainViewController.h"
#import "UITabBarItem.h"

@implementation MainViewController

- (void)viewDidLoad {
    [super viewDidLoad];

    NSArray *tabBarItems = self.tabBarController.tabBar.items;

    // Add your code below! The property for MainViewController's 
    // tab bar controller is named 'tabBarController'.

    // from task 1
    [self.tabBarController setSelectedIndex:2];

    // task 2
    UITabBarItem *tab = tabBarItems[self.tabBarController.selectedIndex];
}

@end

With this code, I am creating a new UITabBarItem called tab. Its value is set using the tabBarItems array created earlier in the code, which is an array of individual tab bar items. Since it's an array, I can use square brackets to access specific items within the array, so I am selecting the currently selected index from the tabBarController (which was just set in the first line), as the instructions ask.