List 5 diagnostic methods to use for preterm labor.
a) Ultrasound, amniocentesis, fetal fibronectin test, cervical length measurement, uterine monitoring
b) Blood pressure measurement, fetal heart rate monitoring, pelvic exam, urine analysis, glucose tolerance test
c) Maternal weight gain, fundal height measurement, kick counts, non-stress test, biophysical profile
d) X-ray, CT scan, MRI, PET scan, electrocardiogram