Suppose How to bake a chocolate cake<br>Preheat the oven to 350°F. Mix together flour, sugar, cocoa powder, baking powder, and salt. In a separate bowl, mix together eggs, milk, oil, and vanilla extract. Gradually add the wet ingredients to the dry ingredients until well combined. Pour the batter into a greased cake pan and bake for 30-35 minutes.
Can we infer that "Adding salt is optional in the chocolate cake recipe."? Yes, no, or maybe?