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MCQ

How do you allocate a matrix using a single pointer in C?(r and c are the number of rows and columns respectively)

int *arr = malloc(r * c * sizeof(int));

int *arr = (int *)malloc(r * c * sizeof(int));

int *arr = (int *)malloc(r + c * sizeof(int));

int *arr = (int *)malloc(r * c * sizeof(arr));

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