Diana is conducting PERT analysis for a project network. She finds that the activities A, B, C, D, E, F, and G are on the critical path. She also determines that the activities A, B, C, D, E, F, and G have standard deviations of 1, 2, 4, 2, 6, 2, and 4 days, respectively. Find the STANDARD DEVIATION of the critical path A-B-C-D-E-F-G.

Group of answer choices

21 days

4.58258 days

3 days

1.73205 days

9 days