Give the Degree of the Polynomial and Identify Its Leading $21 x y z + 18 x ^ { 2 } z - 10 y ^ { 2 } z ^ { 3 } + 2 x y - x ^ { 2 } y ^ { 2 } z ^ { 2 }$

Multiple Choice

Give the degree of the polynomial and identify its leading coefficient.
- $21 x y z + 18 x ^ { 2 } z - 10 y ^ { 2 } z ^ { 3 } + 2 x y - x ^ { 2 } y ^ { 2 } z ^ { 2 }$

A) degree: 6; leading coefficient: 21
B) degree: 5; leading coefficient: 10
C) degree: 6; leading coefficient: -1
D) degree: 6; leading coefficient: 2