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:
Arthur (TV series)
Table title:
Home media releases
Table:
<table id='hittask' contenteditable='False'>
<tr> <th colspan=1 rowspan=1 > DVD Name </th><th colspan=1 rowspan=1 > Ep # </th><th colspan=1 rowspan=1 > Region </th><th colspan=1 rowspan=1 > Release date </th></tr>
<tr> <td colspan=1 rowspan=1 > Season 1 </td><td colspan=1 rowspan=1 > 30 </td><td colspan=1 rowspan=1 > Region 2 </td><td colspan=1 rowspan=1 > April 7, 2008 </td></tr>
<tr> <td colspan=1 rowspan=1 > Season 2 </td><td colspan=1 rowspan=1 > 20 </td><td colspan=1 rowspan=1 > Region 2 </td><td colspan=1 rowspan=1 > November 3, 2008 March 23, 2009 </td></tr>
<tr> <td colspan=1 rowspan=1 > Season 3 </td><td colspan=1 rowspan=1 > 15 </td><td colspan=1 rowspan=1 > Region 2 </td><td colspan=1 rowspan=1 > August 4, 2009 </td></tr>
<tr> <td colspan=1 rowspan=1 > Season 4 </td><td colspan=1 rowspan=1 > 10 </td><td colspan=1 rowspan=1 > TBA </td><td colspan=1 rowspan=1 > TBA </td></tr>
<tr> <td colspan=1 rowspan=1 > Season 5 </td><td colspan=1 rowspan=1 > 10 </td><td colspan=1 rowspan=1 > TBA </td><td colspan=1 rowspan=1 > TBA </td></tr>
<tr> <td colspan=1 rowspan=1 > Season 6 </td><td colspan=1 rowspan=1 > 10 </td><td colspan=1 rowspan=1 > TBA </td><td colspan=1 rowspan=1 > TBA </td></tr>
<tr> <td colspan=1 rowspan=1 > Season 7 </td><td colspan=1 rowspan=1 > 10 </td><td colspan=1 rowspan=1 > TBA </td><td colspan=1 rowspan=1 > TBA </td></tr>
<tr> <td colspan=1 rowspan=1 > Season 8 </td><td colspan=1 rowspan=1 > 10 </td><td colspan=1 rowspan=1 > TBA </td><td colspan=1 rowspan=1 > TBA </td></tr>
<tr> <td colspan=1 rowspan=1 > Season 9 </td><td colspan=1 rowspan=1 > 10 </td><td colspan=1 rowspan=1 > TBA </td><td colspan=1 rowspan=1 > TBA </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > Season 10 </td><td colspan=1 rowspan=1 > 10 </td><td class="highlighted"  colspan=1 rowspan=1 > Region 1 </td><td class="highlighted"  colspan=1 rowspan=1 > March 25, 2008 </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > Season 11 </td><td colspan=1 rowspan=1 > 10 </td><td class="highlighted"  colspan=1 rowspan=1 > Region 1 </td><td class="highlighted"  colspan=1 rowspan=1 > September 2, 2008 </td></tr>
<tr> <td colspan=1 rowspan=1 > Season 12 </td><td colspan=1 rowspan=1 > 10 </td><td colspan=1 rowspan=1 > TBA </td><td colspan=1 rowspan=1 > TBA </td></tr>
<tr> <td colspan=1 rowspan=1 > Season 13 </td><td colspan=1 rowspan=1 > 10 </td><td colspan=1 rowspan=1 > TBA </td><td colspan=1 rowspan=1 > TBA </td></tr>
<tr> <td colspan=1 rowspan=1 > Season 14 </td><td colspan=1 rowspan=1 > 10 </td><td colspan=1 rowspan=1 > TBA </td><td colspan=1 rowspan=1 > TBA </td></tr>
<tr> <td colspan=1 rowspan=1 > Season 15 </td><td colspan=1 rowspan=1 > 10 </td><td colspan=1 rowspan=1 > TBA </td><td colspan=1 rowspan=1 > TBA </td></tr>
</table>
Question:
Which Arthur season sets were released in Region 1?
Answer:
WGBH Home Video released two Region 1 Arthur season sets; they released Season 10 on March 25, 2008 and Season 11 on September 2, 2008.