All but one of the following are characteristics of Agile Release Trains. Which one is not a characteristic of an Agile Release Train?

A sequence of agile teams that trade off in sequence of delivering a Sprint

Typically consisting of $50-125$ individuals.

Produces valuable and evaluate$-$able, system$-$level increments every two weeks and additional program increments every $8-12$ weeks.

Serve as the program$-$level value delivery mechanism in SAFe.