Please choose the correct ending to complete the given sentence: Computers and Electronics: [header] How to kill a tree [title] Remove any loose bark. [step] Girdling is a method for killing a tree by interrupting the flow of sap between the roots and crown of the tree. You can girdle a tree with or without the use of herbicides to speed the process along.

Ending1: [substeps] Girdling is a method meant to flatten the tree. You will build it like a couch, but only on top of the existing wood. Ending2: After all, you're just using the herbicide to diffuse or disseminate the excess sap, thereby causing more damage to the tree. [substeps] Follow any measurements that you've taken to ensure that you don't interrupt or discontinue circulation or the tree could die. Ending3: Girdling is the easiest and most popular method for killing a tree without chemicals when no herbicides are used, but the tree will take many months to die from the process. Start by pulling away any loose bark that gives you easier access to the trunk. Ending4: Herbicides do not kill the tree completely, if at all, but rather stiffen it and weaken it from repeated use of these chemicals. To do this, first wash the tree with distilled water and dry it with clean paper towels.

Answer format: ending1/ending2/ending3/ending4