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:
KBFD-DT
Table title:
Digital channels
Table:
<table id='hittask' contenteditable='False'>
<tr> <th colspan=1 rowspan=1 > Channel </th><th colspan=1 rowspan=1 > Video </th><th colspan=1 rowspan=1 > Aspect </th><th colspan=1 rowspan=1 > PSIP Short Name </th><th colspan=1 rowspan=1 > Programming </th></tr>
<tr> <td colspan=1 rowspan=1 > 32.1 </td><td colspan=1 rowspan=3 > 480i </td><td colspan=1 rowspan=3 > 4:3 </td><td colspan=1 rowspan=1 > KBFD-D1 </td><td colspan=1 rowspan=1 > Main KBFD-TV programming </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > 32.2 </td><td colspan=1 rowspan=1 > KBFD-D2 </td><td class="highlighted"  colspan=1 rowspan=1 > KBS World </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > 32.3 </td><td colspan=1 rowspan=1 > KBFD-D3 </td><td class="highlighted"  colspan=1 rowspan=1 > Arirang </td></tr>
</table>
Question:
What channels does KBS world air on digital format?
Answer:
The KBFD has the programming KBS World on digital channel 32.2 and Arirang programming on digital channel 32.3.