In which two instances should an Administrator perform a search index? (Select 2 answers)

In which two instances should an Administrator perform a search index? (Select 2 answers)
A . After adding a new custom component to the Product Detail Page
B. After making a delta load for the Product Catalog
C. After adding a new category with a product under it which is ready to be sold
D. After making changes to the Product Detail Page layout in Lightning Experience Builder
E. After making changes to shipping calculation settings for Checkout

Answer: B,C