Universal containers has a junction object called invoices with a primary master-detail relationship with accounts and a secondary master-detail relationship with contacts. the app builder has a requirement to change the primary master-detail relationship to lookup. what happens to the master-detail relationship with contacts?

a. the contacts master-detail values are cleared from invoices.
b. the contacts master-detail also converts to lookup.
c. the contacts master-detail field is deleted from the object
d. the contacts master-detail becomes the primary.

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