output of the following program mcq

What will be the output of the following program?
(Assume all the header files are declared)

void main()
{
char x[]="fUncTioNs";
int i=0;
while(x[i]!='\0')
{
if(i%2==1)
x[i]=x[i]+1;
else x[i]='@';
i++;
}
puts(x);
}

a) @U@c@i@N@
b) @V@d@j@O@
c) @U@D@J@N@
d) @U@C@I@N@
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