Which statement successfully completes the program so that TOTAL has a value of 505-6465-09090?

The following SAS program is submitted:

data combine;

prefix=’505’;

middle=’6465 ‘;

end=’09090’;

<insert statement here>;

run;

Which statement successfully completes the program so that TOTAL has a value of 505-6465-09090?
A . total = cat(’-’, prefix, middle, end);
B. total = catx(’-’, prefix, middle, end);
C. total = prefix !!’-’!! middle ‘‘!!’-’!! end;
D. total = prefix!!’-’!! left(middle)!!’-’!! end;