input: Write a function to create a 2D array with random integers between 0 and 255.
  assert len(create_2D_array([3, 3])) == 3
  assert all(len(row) == 3 for row in create_2D_array([3, 3]))
  assert all(0 <= val <= 255 for row in create_2D_array([3, 3]) for val in row)
  assert len(create_2D_array([5, 4])) == 4
output: import random
  
  def create_2D_array(dimensions):
      rows, cols = dimensions
      return [[random.randint(0, 255) for _ in range(cols)] for _ in range(rows)]