Elizabeth is the project manager for a new mobile app. She is using earned value management to control costs. After four months, the schedule variance was -$24,000. After six months, there was no schedule variance. What happened between Months 4 and 6?(For Ref Only, Question #: PM-02556) Group of answer choices The project continued to be behind schedule up to Month 4 and was on schedule during Months 5-6. Elizabeth was lucky that opportunities came up that allowed work to speed up Elizabeth compressed the scheduling using crashing Elizabeth took corrective action that brought the project back on schedule