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