What can you do in order to render a picture in a specific cell in a grid?

A.
Create a custom cell renderer by extending
Mage_Adminhtml_Block_Widget_Grid_Cell_Renderer_Abstract

B.
Create a custom grid renderer by extending
Mage_Adminhtml_Block_Widget_Grid_Renderer_Abstract

C.
Create a custom column renderer by extending
Mage_Adminhtml_Block_Widget_Grid_Column_Renderer_Abstract

D.
Create a custom row renderer by extending
Mage_Adminhtml_Block_Widget_Grid_Row_Renderer_Abstract