闰年的判定条件是能被400整除，或者能被4整除但不能被100整除，正确的Python表达式为（ ）。
A.year%400==0 and year%4==0 and year % 100!=0
B.(year//400==0) or (year//4==0 and year//100!=0)
C.(year%400==0) or (year%4==0 and year % 100!=0)
D.year//400==0 or year//4==0 and year//100!=0