Use Cholesky factorization to determine [U] so that [A] = [U]ᵀ[U] = ⎡⎣⎢6 -10 -12 -10 -12⎤⎦⎥. What is the value of matrix [U]?

a) ⎡⎣⎢2 0 0 0⎤⎦⎥
b) ⎡⎣⎢3 -1 0 0⎤⎦⎥
c) ⎡⎣⎢-3 1 0 0⎤⎦⎥
d) ⎡⎣⎢-2 0 0 0⎤⎦⎥