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The development of NTLMv2 was primarily focused on addressing the vulnerabilities and weaknesses present in the earlier LAN Manager (LM) authentication protocol. LM, which was the first version, had several security flaws, including poor encryption and a lack of protection against certain types of attacks, such as replay attacks. NTLMv2 was designed to provide more robust security features, including improved encryption mechanisms, stronger hashing algorithms, and better overall authentication processes.

The enhancements introduced in NTLMv2 specifically aimed at creating a more secure authentication framework that could withstand modern security threats. By providing support for more complex passwords and utilizing session security measures, NTLMv2 effectively counteracted the weaknesses that were inherent in the LM protocol. This makes the focus on addressing those vulnerabilities the defining feature of NTLMv2's development. Other options may discuss general improvements, but they do not encapsulate the primary motivation behind NTLMv2's development as clearly as this one.