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:
PureSystems
Table title:
PureFlex
Table:
<table id='hittask' contenteditable='False'>
<tr> <th colspan=1 rowspan=1 >  </th><th class="highlighted"  colspan=1 rowspan=1 > Express </th><th class="highlighted"  colspan=1 rowspan=1 > Standard </th><th class="highlighted"  colspan=1 rowspan=1 > Enterprise </th></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > IBM PureFlex System 42U Rack </td><th colspan=3 rowspan=1 > 1 </th></tr>
<tr> <td colspan=1 rowspan=1 > IBM Flex System Enterprise Chassis </td><th colspan=3 rowspan=1 > 1 </th></tr>
<tr> <td colspan=1 rowspan=1 > IBM Flex System Fabric EN4093 10Gb Scalable Switch </td><th colspan=2 rowspan=1 > 1 </th><th colspan=1 rowspan=1 > 2 with both port-count upgrades </th></tr>
<tr> <td colspan=1 rowspan=1 > IBM Flex System FC3171 8Gb SAN Switch </td><th colspan=1 rowspan=1 > 1 </th><th colspan=2 rowspan=1 > 2 </th></tr>
<tr> <td colspan=1 rowspan=1 > IBM Flex System Manager Node </td><th colspan=3 rowspan=1 > 1 </th></tr>
<tr> <td colspan=1 rowspan=1 > IBM Flex System Manager software license </td><th colspan=1 rowspan=1 > IBM Flex System Manager with 1-year service and support </th><th colspan=2 rowspan=1 > IBM Flex System Manager Advanced with 3-year service and support </th></tr>
<tr> <td colspan=1 rowspan=1 > Chassis Management Module </td><th colspan=3 rowspan=1 > 2 </th></tr>
<tr> <td colspan=1 rowspan=1 > 2500W power supply modules (equ./max.) </td><th colspan=1 rowspan=1 > 2 / 6 </th><th colspan=1 rowspan=1 > 4 / 6 </th><th colspan=1 rowspan=1 > 6 / 6 </th></tr>
<tr> <td colspan=1 rowspan=1 > Chassis 80 mm fan modules (equ./max.) </td><th colspan=1 rowspan=1 > 4 / 8 </th><th colspan=1 rowspan=1 > 6 / 8 </th><th colspan=1 rowspan=1 > 8 / 8 </th></tr>
<tr> <td colspan=1 rowspan=1 > IBM Storwize V7000 Disk System </td><th colspan=3 rowspan=1 > Yes (redundant controller) </th></tr>
<tr> <td colspan=1 rowspan=1 > IBM Storwize V7000 Software </td><th colspan=1 rowspan=1 > Base with 1-year software maintenance agreement </th><th colspan=2 rowspan=1 > Base with 3-year software maintenance agreement </th></tr>
</table>
Question:
What types of IBM PureFlex are available?
Answer:
IBM PureFlex is available in three types: Express, Standard, and Enterprise.