Ursa Major Solar requires a new field called Planet Details on the Planet object, where users can write detailed descriptions that can include pictures and links. The Rich Text Area field type is the best fit for this requirement.
Option B (Rich Text Area): A Rich Text Area field allows users to enter text with formatting options such as bold, italics, bullets, and numbering. Additionally, it supports inserting images and hyperlinks, which matches the requirement of including pictures and links in the description.
Reference:
Option A (Long Text Area): A Long Text Area field allows for lengthy text input but does not support formatting or embedding of images and links, which are necessary in this case.
Option C (Multi-Select Picklist): A Multi-Select Picklist allows users to select multiple values from a list but is not suitable for detailed descriptions or embedding images and links.
Option D (URL): A URL field is used to store and display a link but does not support text input or embedding images.
In summary, the Rich Text Area field type should be used because it allows formatted text, images, and links, which are required for the Planet Details field.
Reference:
Rich Text Area Field Documentation

The best type of sandbox for each team member to use is a developer sandbox. A developer sandbox is a copy of production that includes only the metadata, such as objects, fields, layouts, etc. It does not include any data, such as records or attachments. A developer sandbox is ideal for small projects that do not require data testing, such as developing new features or customizations. A developer sandbox has a storage limit of 200 MB and can be refreshed once per day. A developer sandbox is also cheaper than other types of sandboxes. A full sandbox is a copy of production that includes all the metadata and data. It is ideal for large projects that require data testing, such as performance testing or integration testing. A full sandbox has the same storage limit as production and can be refreshed every 29 days. A full sandbox is also the most expensive type of sandbox. A developer pro sandbox is similar to a developer sandbox, but it has a larger storage limit of 1 GB and can be refreshed every 5 days. It is ideal for projects that require some data testing, such as data migration or quality assurance testing. A partial sandbox is similar to a full sandbox, but it has a smaller storage limit of 5 GB and can be refreshed every 5 days. It is ideal for projects that require selective data testing, such as user acceptance testing or staging testing

The app builder should use Web-to-Case to enable visitors to the website to open cases. Web-to-Case is a feature that allows users to create an HTML form that can be embedded into a public-facing website. When visitors fill out and submit the form, a new case is automatically created in Salesforce with the information from the form fields. Web-to-Case can also assign cases to queues or users based on predefined rules and criteria. Outbound message is not a valid tool, as it does not enable visitors to open cases. An outbound message is a type of workflow action that sends a secure XML message to a designated endpoint URL when a record meets certain criteria. An outbound message can be used to integrate Salesforce with external systems or applications. Screen flow is not a valid tool, as it does not enable visitors to open cases from a public-facing website. A screen flow is a type of flow that allows users to create an interactive guided process that can collect, display, and update data from multiple objects within Salesforce. A screen flow can be embedded into Lightning pages or Visualforce pages, but it cannot be exposed to unauthenticated users on a public website. Email-to-Case is not a valid tool, as it does not enable visitors to open cases from a website. Email-to-Case is a feature that allows users to create cases from email messages sent to a specific email address. Email-to-Case can also capture email attachments and thread information and associate them with the case.