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The correct answer highlights that Media Mail and Standard Post are indeed classes of mail that are open to inspection. These classes of mail are generally less sensitive and subject to fewer privacy restrictions compared to others, allowing postal employees to inspect them for compliance with postal regulations.

Media Mail, primarily used for the distribution of educational materials, has specifications regarding the types of content that can be included, which necessitates a certain level of inspection to ensure compliance. Similarly, Standard Post parcels are also open for inspection to ensure they conform to postal requirements and do not contain prohibited items.

The other classes mentioned in the other options have greater restrictions on privacy. For instance, Express Mail and Registered Mail include tracking and secure handling features, which implies a higher level of confidentiality and protection, thereby limiting the scope for inspection. Certified Mail and Priority Mail also provide tracking and delivery confirmation, underscoring their need for privacy. First Class Mail and Parcel Select typically have more stringent privacy protocols to protect the content, which rules them out for general inspection. Hence, the choice of Media Mail and Standard Post as classes of mail open to inspection is accurate in this context.