A record-triggered flow can be used to automate actions when a record is created or updated. In this case, a record-triggered flow can be configured to create a new opportunity and send an email to the contracts team when an opportunity is marked as closed won.

Update the organization-wide defaults and create a criteria based sharing rule are two actions that an app builder should complete to implement the change of moving to a more restrictive sharing model while allowing the Sales team to access all account records with the sales record type. Updating the organization-wide defaults can set the baseline level of access for accounts, and creating a criteria based sharing rule can grant additional access based on record type. Updating the Sales profile and creating an owner-based sharing rule are not necessary or sufficient actions for this change.

AppExchange and Apex Code are two resources that can provide custom components for a Lightning app. AppExchange is a marketplace where developers can publish and sell their custom components or apps. Apex Code is a programming language that can be used to create custom components or logic for a Lightning app. Import Wizard and Visualforce are not resources for custom components, but tools for data import and web page development respectively.

Changing the data type of custom fields in Salesforce has specific limitations that need to be considered to ensure system integrity and prevent errors:
A . It is not possible to change the data type of a formula field to any data type. Formula fields are calculated based on other field values and cannot be converted into a storage data type because they do not store data themselves.
D . It is not possible to change the data type of a Text Area (Long) field to Text. Text Area (Long) fields support up to 131,072 characters, which far exceeds the 255 character limit of standard Text fields. Converting such a field to a smaller capacity field would potentially lead to data truncation or loss.
For official guidance on data type changes, refer to Salesforce's Custom Field Considerations.