Among the solutions provided, which one is correct?

Of the four solutions provided, which one is correct? Give a short explanation on how you know using mathematical concepts and terminologies. Question: Factor the following expression: 54(a + b)3 - 27(a+ b)5 Solution 1: Solution 2: 9(a + b)3[6 - 3(a + b)3] 27(a + b)3[2 - (a+ b)=] Solution 3: Solution 4: 3(a + b)3 [18 - 9(a + b)2] 27(a + b)