单项选择题

依次执行以下命令后的输出结果是
SET DATE TO YMD
SET CENTURY ON
SET CENTURY TO 19 ROLLOVER 10
SET MARK TO"."
CTOD("49-05-01")

A) 49.05.01
B) 1949.05.01
C) 2049.05.01 D) 出错