What should be considered when configuring the lead conversion process? (2 answers)

What should be considered when configuring the lead conversion process? (2 answers)
A . Standard lead fields are automatically converted into account, contact and opportunity fields
B. Custom Lead fields can be mapped to custom object fields
C. Roll-up Summary Lead Fields can be mapped to custom contact fields
D. Custom Lead fields can be mapped to account, contact and opportunity fields

Answer: A,D