N.Y. Comp. Codes R. & Regs. tit. 9, § 6210.15
(a) Standards indicating a valid vote. A vote cast on a paper ballot shall be the choice made by a voter, not to exceed the maximum allowable votes per race or question than the number for which the voter is eligible to vote, by: (the examples below in this section apply to all types of voting position target areas on ballots, regardless of what form they may take e.g. rectangle, oval, circle, square, open arrow):
(b) Standards indicating an invalid vote. A voter's choice shall be considered an invalid vote, if the: