Approval

[DEMOREP1 at aol.com]

Plurality 

1 vote for 1 choice, 0 votes for all other choices

Approval

1 vote for 1 or more choices, 0 votes for all other choices

Such 2 or more "1`" votes are unranked tie votes.

Approval is, in effect, super-plurality.

However, it is available for low tech areas (most of the world) and does 
produce highest plurality/ majority winners (pending number voting in such 
low tech areas).

Thus, Approval is in the Plurality- Bucklin- Approval group.