What will be the output of the following Python code?
>>> a={4,5,6}>>> b={2,8,6}>>> a+b
a) {4,5,6,2,8}
b) {4,5,6,2,8,6}
c) Error as unsupported operand type for sets
d) Error as the duplicate item 6 is present in both sets
>>> a={4,5,6}>>> b={2,8,6}>>> a+b
a) {4,5,6,2,8}
b) {4,5,6,2,8,6}
c) Error as unsupported operand type for sets
d) Error as the duplicate item 6 is present in both sets