According to the Salesforce documentation1, the following types of electronic health record data transmitted via HL7 can be stored in Salesforce objects:
Observation Results (ORU): ORU messages contain clinical observations and results, such as lab tests, vital signs, or imaging reports. ORU messages can be stored in the DiagnosticReport object in Health Cloud1.
Admission, Discharge, Transfer Data (ADT): ADT messages contain information about patient admissions, discharges, transfers, or updates, such as demographics, insurance, or diagnosis. ADT messages can be stored in the EhrPatient object in Health Cloud1.
Clinical Document Architecture (CDA): CDA is a standard for exchanging clinical documents, such as discharge summaries, progress notes, or referrals. CDA documents can be stored in the Document object in Health Cloud1.

B is correct because enabling person accounts from Setup is a prerequisite to install the Health Cloud managed package. Person accounts are a special type of account that combines the attributes of an account and a contact. Health Cloud uses person accounts to represent patients and members, and to enable various features and functionality, such as household data model, clinical data model, care management, and provider network management.
C is correct because enabling Chatter settings from Setup is a prerequisite to install the Health Cloud managed package. Chatter is a collaboration tool that allows users to communicate and share information with each other. Health Cloud uses Chatter to enable features such as care team collaboration, patient engagement, and social determinants of health.
D is correct because enabling contacts to relate to multiple accounts is a prerequisite to install the Health Cloud managed package. This feature allows users to create relationships between a contact and multiple accounts, and specify the role and status of each relationship. Health Cloud uses this feature to enable features such as actionable relationship center, patient provider relationship, and referral management.
A is incorrect because making data protection details available in records is not a prerequisite to install the Health Cloud managed package, but an optional step that can be done after the installation. Data protection details for records allow users to view and edit the data protection level and data classification for each record on leads, contacts, and person accounts.
E is incorrect because logging a support case to have person accounts enabled is not a prerequisite to install the Health Cloud managed package, but an alternative way to enable person accounts if they are not available in Setup. However, this method requires contacting Salesforce Customer Support and waiting for their response, which may take longer than enabling person accounts from Setup.

According to the Salesforce documentation3, when setting up a new care request record, you need to choose a case record type to identify the care request type. The care request type determines what fields and values are available on the care request record. There are four predefined care request types in Health Cloud: Physician Request, Drug Request, Admission Request, and Appeal Request. You can also create custom care request types to suit your business needs3.