单选题：以下针对全局变量的叙述错误的是

题目内容：

以下针对全局变量的叙述错误的是 A．用extern说明符可以限制全局变量的作用域
B．全局变量是在函数外部任意位置上定义的变量
C．全局变量的作用域是从定义位置开始至源文件结束
D．全局变量的生存期贯穿于整个程序的运行期间

参考答案：

答案解析：

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