How to kill tank on foot?

[DorkFish]

This is probably too noob of a question as tactics so im putting it here. If I am on foot, are these the only options to kill a tank?

1) Anti-Tank class using Panzerfaust or AT Rifle
2) Russian demo man using satchel
3) Any class picking up AT weapon like Panzerfaust or AT Rifle from ground

Is there any way to blow up a tank with just regular rifle or smg or handgrenade? Sorry i dont really know how real tank works.. plz let me know. I've always been throwing grenades at tanks hoping it would blow it up but i never could.

THanks