Which is the correct simplification of xa−b⋅xb−c⋅xc−ax^{a-b} \cdot x^{b-c} \cdot x^{c-a}xa−b⋅xb−c⋅xc−a?
xabcx^{abc}xabc
1
xa+b+cx^{a+b+c}xa+b+c
0