Which of the following is the correct way to initialize an array in C++?int arr[3] = {1, 2, 3};int arr = {1, 2, 3};int arr[3] = 1, 2, 3;int arr[] = {1, 2, 3};

To determine the correct way to initialize an array in C++, let's analyze the provided options:

1. Option A: int arr[3] = {1, 2, 3};
2. Option B: int arr = {1, 2, 3};
3. Option C: int arr[3] = 1, 2, 3;
4. Option D: int arr[] = {1, 2, 3};

Analysis of Each Option:

1. Option A:

   • This syntax is correct. It explicitly declares an array of size 3 and initializes it with the values 1, 2, and 3.

2. Option B:

   • This is incorrect because it does not specify the size of the array and tries to initialize it directly without using the array notation.

3. Option C:

   • This syntax is incorrect. Although it declares an array of size 3, the initialization list is not properly formatted. The correct way requires curly braces.

4. Option D:

   • This syntax is also correct. It declares an array without explicitly stating its size, allowing the compiler to deduce the size from the number of initializers provided.

Final Conclusion:

The correct ways to initialize an array in C++ among the provided options are:

• Option A: int arr[3] = {1, 2, 3};
• Option D: int arr[] = {1, 2, 3};

Thus, both Option A and Option D are valid initializations for an array in C++.