Lecture 10 (Logic) Axioms of Arithmetic

In the axiomatic system for ℝ presented in the lecture, which symbols are the PRIMITIVES?

1. A.+, ·, =, 0, 1
2. B.+, ·, <, 0, 1
3. C.+, ·, <, =, 0, 1, −
4. D.ℝ, +, ·, <