How is PIP controlled or measured with self-inflating vs. flow-inflating vs. T-piece?
a) Flow-inflating bags have adjustable PIP levels; self-inflating bags rely on user monitoring; T-piece has fixed PIP
b) Self-inflating bags have adjustable PIP levels; flow-inflating bags rely on user monitoring; T-piece has fixed PIP
c) Self-inflating bags have fixed PIP levels; flow-inflating bags have adjustable PIP; T-piece relies on user monitoring
d) Flow-inflating bags have fixed PIP levels; self-inflating bags have adjustable PIP; T-piece relies on user monitoring