What Does Portability Mean as It Refers to the CPP

What does portability mean as it refers to the CPP?

A) If the pensioner dies, the plan continues to pay to the spouse of the pensioner.
B) The plan moves with workers when they change jobs.
C) The plan moves with recipients if they leave the country.
D) Workers can choose to invest more than the required amount, thereby increasing the benefits they receive at retirement.