This one I for sure do not know:
"a) the tip ending with a flared hole"
So it must be d), electronic engineer retired speaking here, lol.

But the last time I tried to plant a few shrubs I managed to swing the handle end between my legs. Needless to say it was umcomfortable. Understand am 65+ and on occasion before difficult or undesired tasks I do imbibe into flavourfull wines so some tasks do not go as smoothly as they should but am always in good humour. Even unpleasant tasks have their pleasant sides.
( sorry I can not attend the annual Classic and meet many of you because I spend end of summers in Europe.)

I wish to all of you plenty of patience and good humour with you investments. Still more trying times ahead but many of you must be seeing the light at the end of the tunnel, Cheers. Ed G.