You CANNOT delete standard fields but you can remove non-required standard fields from a page layout.
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A. B.A.
The statement is true. In Salesforce, there are two types of fields - standard fields and custom fields. Standard fields are provided by Salesforce and are available in all objects, while custom fields are created by the user.
Standard fields cannot be deleted, but they can be removed from a page layout if they are not required. This means that if you remove a non-required standard field from a page layout, it will not be displayed on the page layout anymore. However, if the field is required, you will not be able to remove it from the page layout.
It's important to note that removing a field from a page layout does not delete the field from the object or the database. The field will still exist and can be added back to the page layout at any time.
In summary, you cannot delete standard fields in Salesforce, but you can remove non-required standard fields from a page layout.