Which would be the first sentence after rearrangement?

Directions : Rearrange the following six sentences (A), (B), (C), (D), (E) and (F) in the proper sequence to form a meaningful paragraph; then answer the questions.
A. It has its roots in an attack on India’s parliament in 2001, which was carried out by terrorist groups allegedly used as proxies by Pakistan’s powerful intelligence services (ISI).
B. Cold Start is an attempt to draw lessons from this: having nimbler, integrated units stationed closer to the border would allow India to inflict significant harm before international powers demanded a ceasefire.
C. Yet India has refused to own up to the existence of the doctrine since it was first publicly discussed in 2004.
D. Cold Start is the name given to a limited-war strategy designed to seize Pakistani territory swiftly without, in theory, risking a nuclear conflict. E. Nor was its rumoured existence enough to stop Pakistani terrorists from launching devastating attacks in Mumbai in 2008, killing 164 people. F. India’s response to the onslaught was a flop: by the time its lumbering Strike Corps were mobilised and positioned on the frontier, Pakistan had already bulked up its defences, raising both the costs of incursion and the risk that it would escalate into a nuclear conflict.