If you accessed the same article electronically, the reference would $...$

$($A$)$ include all the details of the article, with the addition of $[$online$]$ after the journal title, the url, and the date of access.

B include all the details of the article, with the addition of $[$online$]$ after the journal title.

$($c$)$ include all the details of the article, with the addition of the url at which you found it$.$

$($D$)$ be the same as the reference for the article in the printed journal.