Enumerating Different Potential Implementation Environments That Could Be Used to Deliver

Enumerating different potential implementation environments that could be used to deliver the different sets of capabilities occurs during the:

A) requirements structuring step of the analysis phase.
B) shaping alternative system design strategies phase.
C) testing step of the implementation and operation phase.
D) project initiation and planning step of the planning and selection phase.
E) designing the human interface step of the design phase.