Nectaries secrete sweet liquid to attract and feed pollinators.
A hydathode is a type of secretory tissue in leaves, usually found in Angiosperms and peridophytes, that secretes water through pores in the epidermis or margin of leaves, typically at the tip of a marginal tooth or serration.
A laticifer is a type of elongated secretory cell found in the leaves and/or stems of plants that produce latex and rubber as secondary metabolites.
Thus, the correct answer is option D.