In 2009 the software was completely revised. (optional  (optional comma as refers to time-In 2009, the software.). by Jennie Ruby    Last week's challenge was a tough one. Several readers correctly punctuated the sentences but did not correctly identify which commas were optional. Sadly, only a minority of respondents got everything right. Here are the answers as presented by  Larena Jackson. The goals were to correctly punctuate (or refrain from punctuating) these introductory phrases and to indicate whether the comma was optional or required.