What will be the output of the following Python code?

def c(f):
    def inner(*args, **kargs):
        inner.co += 1
        return f(*args, **kargs)
    inner.co = 0
    return inner
@c
def fnc():
    pass
if __name__ == '__main__':
    fnc()
    fnc()
    fnc()
    print(fnc.co)

A. 4

B. 3

C. 0

D. 1

Answer: Option B