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Write a function `sort_matrix(matrix)` that takes a 2D list (matrix) as input and returns a new matrix where the rows are sorted in ascending order based on the sum of their elements. #### Example Usage ```python [main.nopy] matrix = [[1, 2, 3], [2, 4, 5], [1, 1, 1]] result = sort_matrix(matrix) print(result) # Output: [[1, 1, 1], [1, 2, 3], [2, 4, 5]] matrix = [[5, 8, 9], [6, 4, 3], [2, 1, 4]] result = sort_matrix(matrix) print(result) # Output: [[2, 1, 4], [6, 4, 3], [5, 8, 9]] ``` #### Constraints - The input matrix will be a list of lists, where each inner list represents a row. - Each row will contain integers. - The matrix will have at least one row and one column.
def sort_matrix(matrix):
"""
Sorts a matrix in ascending order based on the sum of its rows.
Args:
matrix (list of list of int): The input 2D list.
Returns:
list of list of int: The sorted matrix.
"""
# Implement the sorting logic here
pass