Outfit number 4 is correct. You should choose washable rubber boots, clean overalls, impermeable gloves, eye protection, and a P2 mask/respirator. Considering that you may be exposed to reproductive fluids, disposable, impermeable overalls are best, however properly managed cloth are acceptable if worn with impermeable outerwear. Eye protection and a P2 mask/respirator are particularly important given the potential aerosol/droplet spread of some of these agents.

Additionally, you should be considering non-PPE protocols such as equipment disinfection, hand hygiene, and Q fever vaccination status of yourself and those in contact with this herd.

The AVA Guidelines for Veterinary Personal Biosecurity (PDF download) provides some further advice - including a checklist of PPE standards for dental and obstetric procedures (PDF download).