Which of the following conditions should the project manager consider when working on the scheduling...

Defining, sequencing, estimating activity duration, and developing a schedule model are so tightly inked that they are viewed as a single process.

The detailed project schedule should remain flexible throughout the project to accommodate newly gained knowledge

An iterative scheduling and on-demand, pull-based scheduling will be required.

To address the full delivery schedule, a range of techniques may be needed and then need to be adapted