●The construct
cobegin
Statement1；
Statement2；
coend
means Statement1 and Statement2 are to be executed in parallel．The only two atomic actions in this construct are loading the value of a variable and storing into a variable．For the program segment
x=0；y=0；
cobegin
{x=1；y+=x；}
{y=2；x+=3；}
coend
Which of the following indicate(s)possible values for the variables when the segment finishes execution? (74) ．
Ⅰ．x=1，y=2
Ⅱ．x=1，y=3
Ⅲ．x=4，y=6
(74) A．Ⅰ
B．Ⅰ，Ⅱ
C．Ⅰ，Ⅲ
D．Ⅱ and Ⅲ
