the answer is : (a.b.c)+(a.b.c)+(a.b.c)+(a.b.c)

i need the work please

Q. 4 Maximum score 20 Consider a circuit with three inputs and one output such that the output is 1 if and only if an even number (0 or 2) of its inputs is 1; otherwise the circuit output is 0. (Thus the total number of 1 bit in the input and the output is always an odd number. Such a circuit is known as odd-parity circuit and is used in error checking.). Write the Boolean expression for this