Which of the following two options are available when adding product listings through Vendor Central?

Upload products by online product form or by spreadsheet is the correct answer because Vendor Central offers two main options for adding product listings: using the online product form or uploading a spreadsheet. The online product form allows vendors to manually input product details for each listing, providing a more streamlined way to add individual products. Alternatively, vendors can upload product listings in bulk using a spreadsheet, which is ideal for larger inventories and enables quicker listing of multiple products at once. These methods provide flexibility and efficiency in managing product catalogs within Vendor Central. The other options mentioned, such as using a .pdf document or reaching out to a Vendor Manager, are not standard methods for adding product listings in Vendor Central.