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【单选题】
以下关于脚本的运行方式的差异说法正确的是A.
以source方式执行脚本，脚本也是在当前bash的执行的，因此如脚本中用echo $$显示进程PID，输出值与在当前终端中用echo $$显示进程PID一样
B.
以绝对路径还、相对路径、$PATH方式、bash命令执行脚本，脚本其实是在当前bash中执行的
C.
以source方式执行脚本，脚本也是在当前bash子程序的bash中执行的，因此如脚本中用echo $$显示进程PID，输出值与在当前终端中用echo $$显示进程PID不同
D.
当脚本在当前bash的子程序的bash中执行时，子程序的bash退出，则子程序bash内的所有数据（包括环境变量等）全部被保留
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