K-4 Ballistic Missile

Current context: India has successfully test-fired the K-4 ballistic missile off the Vizag coast in Andhra Pradesh on 19th January 2020.

The K-4 ballistic missile is a 3,500 kilometre range nuclear capable missile that can be launched from a submarine.
The missile was developed by Defence Research and Development Organisation (DRDO).
With this successful trial, India has moved one more step towards the induction of this ballistic missile on the INS Arihant class of nuclear submarines.
Only the US, Russia and China have submarine-launched ballistic missiles of 3,500-kilometre range.
K-4 is one of the two underwater missiles that are being developed by India for its submarine force and the other one is BO-5.
The key features of the K-4 ballistic missile are:

The three-metre-tall missile carries a nuclear warhead of over one tonne.
It’s circular error of probability (the radius of the missile’s point of impact) that is also a measure of the efficacy of its guidance systems was 40 meters or less.
Capable to strike targets from stand-off ranges.
Launch platform‎: ‎Arihant class submarines
Operational range‎: ‎3,500 km (2,200 mi)

Question:

Q.1 The operational range of the K-4 ballistic missile is ___________?
a. 2000 km
b. 2500 km
c. 3000 km
d. 3500 km