What condition must be met by a pressure$$standing wave pattern in a tube with one end closed and the other end open?

Question $3$ options:

a$)$ there must be an antinode at each end.

b$)$ there must be an antinode at the closed end and a node at the open end.

c$)$ there must be a node at each end.

d$)$ there must be a node at the closed end and an antinode at the open end.