Final vote: NO
Should probably use something that only allows 1 vote per IP address. I think strawpoll.com and livepoll.io can do that.
VPN voting is also not allowed with this poll. I personally use a VPN and will have to turn mine off to vote on this.
No they shouldn’t, but without any restrictions 1 individual with 300 bot accounts and VPNs can vote as many times as those 300 students.