[Solved] Identify the error in this C# code snippet:var numbers = new List {1, 2, 3, 4}; var groups = numbers.GroupBy(n => n % 2 == 0); Console.WriteLine(groups.Count()); | C Sharp (C#)

C Sharp (C#) - LINQ Fundamentals

Identify the error in this C# code snippet:

var numbers = new List {1, 2, 3, 4};
var groups = numbers.GroupBy(n => n % 2 == 0);
Console.WriteLine(groups.Count());

AMissing using System.Linq directive

BNo error; code runs and prints 2

CGroupBy requires a key selector returning string, not bool

DCannot call Count() on GroupBy result

Step-by-Step Solution

Solution:

Step 1: Check GroupBy key selector
The key selector returns a bool, which is valid as a key type.
Step 2: Verify Count() usage
The result of GroupBy implements IEnumerable, so Count() is valid with System.Linq.
Final Answer:
No error; code runs and prints 2 -> Option B
Quick Check:
GroupBy with bool key works and Count() is valid [OK]

Quick Trick: GroupBy key can be any type, including bool [OK]

Common Mistakes:

MISTAKES

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