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Which of the following correctly creates a macro variable in a PROC SQL step?

 

proc sql noprint;
    select avg(Days)
    into:NumDays
    from certadv.all;
quit;

%put &=NumDays;

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proc sql noprint;
    select avg(Days)
    into NumDays
    from certadv.all;
quit;

%put &=NumDays;

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proc sql noprint;
    select avg(Days) as NumDays
    from certadv.all;
quit;

%put &=NumDays;

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proc sql noprint;
    select Days
    into avg(Days) as NumDays
    from certadv.all;
quit;

%put &=NumDays;

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