A 6-year-old girl presents with a left breast mass. Her mother first noticed it a day before and is very concerned because both the child's maternal grandmother and maternal aunt have had breast cancer. It is firm, smoothly circumscribed, and slightly eccentric under the left areola. The right breast is unremarkable. You suggest
Immediate excisional biopsy A mammogram Repeat examination in 1 month Genetic testing for breast cancer (BRCA) 1 and 2 mutations