Please read the following table in HTML format from a webpage and then answer the question in detail according to the table. Each table cell is defined by a <td> and a </td> tag. Each table row starts with a <tr> and ends with a </tr> tag. 'rowspan=m' and 'colspan=n' represents a cell spaning over 'm' rows and 'n' columns.

Webpage title:
Run the World (Girls)
Table title:
Release history
Table:
<table id='hittask' contenteditable='False'>
<tr> <th colspan=1 rowspan=1 > Country </th><th colspan=1 rowspan=1 > Date </th><th colspan=1 rowspan=1 > Format </th></tr>
<tr> <th colspan=1 rowspan=1 > Worldwide </th><td colspan=1 rowspan=2 > April 21, 2011 </td><td colspan=1 rowspan=1 > Digital download </td></tr>
<tr> <th colspan=1 rowspan=1 > Australia </th><td colspan=1 rowspan=1 > Contemporary hit radio </td></tr>
<tr> <th colspan=1 rowspan=3 > United States </th><td colspan=1 rowspan=3 > April 26, 2011 </td><td colspan=1 rowspan=1 > Contemporary hit radio </td></tr>
<tr> <td colspan=1 rowspan=1 > Urban radio </td></tr>
<tr> <td colspan=1 rowspan=1 > Urban adult contemporary radio </td></tr>
<tr> <th class="highlighted"  colspan=1 rowspan=1 > Australia </th><td class="highlighted"  colspan=1 rowspan=4 > September 2, 2011 </td><td class="highlighted"  colspan=1 rowspan=5 > Digital EP </td></tr>
<tr> <th class="highlighted"  colspan=1 rowspan=1 > New Zealand </th></tr>
<tr> <th class="highlighted"  colspan=1 rowspan=1 > Europe </th></tr>
<tr> <th class="highlighted"  colspan=1 rowspan=1 > United Kingdom </th></tr>
<tr> <th colspan=1 rowspan=1 > United States </th><td colspan=1 rowspan=1 > April 2, 2013 </td></tr>
</table>
Question:
What countries did the Digital EP of Run the World release on September 2, 2011? 
Answer:
A Digital EP of Run the World (Girls) was released in Australia, New Zealand, Europe, and the UK, on September 2, 2011.