Which among the following is a dead permanent plant tissue?

The cells are long, narrow, thick and lignified, usually pointed at both ends. The cell wall is evenly thickened with lignin and sometimes is so thick, that the cell cavity or lumen is absent. Nucleus is absent and hence the tissue is made up of dead cells. They have simple often, oblique pits in the walls. The middle lamella i.e. the wall between adjacent cells, is conspicuous.