Which of the Following Concepts Were Considered in Gradjelick V

Which of the following concepts were considered in Gradjelick v. Hance, the case in the text in which the plaintiff alleged that the landlord exacerbated a fire caused by another tenant smoking, by failing to maintain the premises?

A) The court articulated the test for per se code violations.
B) The court considered how a rent escalation clause would impact the landlord-tenant relationship.
C) The court ruled that by failing to act to protect the plaintiff, the landlord was liable to the plaintiff for breach of the covenant of quiet enjoyment.
D) The court ruled that only because the lease itself placed a duty of quiet enjoyment on the landlord, the landlord had a duty to control the actions of the upstairs tenant.
E) The court contemplated the issue related to a landlord's lien in the context of the case.