Which protein options are offered in "Aussie Tacos"?

The correct answer highlights the protein options available in "Aussie Tacos," specifically focusing on the offerings of Grilled Chicken or Steak. These proteins align with the Outback Steakhouse’s theme of offering hearty, flavorful dishes that reflect an Australian flair. The combination of Grilled Chicken and Steak provides a versatile option that caters to both poultry lovers and red meat enthusiasts.

While there are a variety of other proteins that could potentially be included in taco-style dishes, such as pork, shrimp, vegetarian options, or even fish, they do not specifically align with the "Aussie Tacos" menu item at Outback. The emphasis here is on the classic pairing of chicken and steak in a taco format, which is in line with the restaurant's focus on bold, satisfying flavors.