B
Trusted Certificate Authorities (CAs) play a crucial role in establishing trust for digital certificates in a public-key infrastructure (PKI). However, in the context of the question, the focus is on the exchange of public keys between two specific users (tom0426871442 and dan1968754032). Trusted CAs are typically involved in broader scenarios where a third-party entity vouches for the authenticity of an entity's public key through the issuance of digital certificates.
For individual users exchanging public keys directly, a Web of Trust model is more applicable. In a Web of Trust.
Why not B?
This is the definition of Web of trust from Wikipedia:
In cryptography, a web of trust is a concept used in PGP, GnuPG, and other OpenPGP-compatible systems to establish the authenticity of the binding between a public key and its owner. Its decentralized trust model is an alternative to the centralized trust model of a public key infrastructure (PKI), which relies exclusively on a certificate authority (or a hierarchy of such).[1] As with computer networks, there are many independent webs of trust, and any user (through their public key certificate) can be a part of, and a link between, multiple webs.
It seems suitable for the use case in the question
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