According to the PKI trust implementation model, a company with multiple CAs and intermediate CAs issuing digital certificates in different departments, with no one cross-checking their work, will need to use Hierarchical Trust Model.
This is because the Hierarchical Trust Model allows a root CA at the top, giving the information and the intermediate CAs.
The intermediate CAs in the hierarchical trust model generally trust the information given by the root.
Thus, without cross-checking their work, the company can afford to use the hierarchical trust model because it is true proof.
Hence, in this case, it is concluded that the correct answer is the Hierarchical Trust Model.
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