Invoices in SAP need to be reviewed from Salesforce Account object Home. (Select 2)

A user has requested a field that counts the number of child records associated with a custom object. These custom objects have a lookup relationship between each other.
Which feature would best accomplish this requirement?

Universal Containers has a customer base where many customers have the same or similar company names.
Which functionality should be configured to improve an end user`s search experience?
Choose 2 answers

To leverage flows you need to __________.

Universal Containers has a new custom object for Invoices that includes an Invoice Number field, Before the Invoice object can be used, invoices will be migrated from an external system maintaining their current Invoice Number. After the migration, salesforce will be the system of record and each new Invoice created in Salesforce must have a unique Invoice Number.
How should the app builder configure the Invoice Number field?