Working through the timeframes in order shows that 14 days is the figure the provision actually sets.
One of the goals behind the BNSS was to stop complainants from being left completely in the dark when the police quietly decide not to pursue a case. To achieve that, the law attaches a fixed clock to the officer's duty to inform. Each option below is a candidate for that clock.
The notification safeguard built into this provision is tied to a 14 day window, not any of the other periods listed.
Therefore, the correct answer is 14 days.