Which of the following is an advantage of using GERT?

Discretionary dependencies relate to project management scheduling where a specific sequence is chosen for flexibility, not a unique advantage of GERT over other network diagrams.

Dummy activities are used in AOA (Activity-On-Arrow) network diagrams to show logical dependencies without consuming time or resources, a feature found in CPM/PERT but not a distinct advantage of GERT.

Slack time (or float) is more easily determined and analyzed using deterministic methods like Critical Path Method (CPM) than with probabilistic methods like GERT.

GERT (Graphical Evaluation and Review Technique) is designed to handle stochastic network models where activities can have multiple outcomes, and the probability of each outcome can be assigned. This allows for a more realistic representation of projects with high uncertainty or alternative paths, which traditional PERT/CPM cannot easily model.