1) A sound wave from a violin is an example of a(n)... *
O A) Electromagnetic wave
B) Digital signal
O C) Analog signal
O D) Transverse wave

Need answer asap

Suppose that f : rn → rm and that a ∈ k, where k is a connected subset of rn . suppose further that for each x ∈ k there exists a δx > 0 such that f(x) = f(y) for all y ∈ bδx (x). prove that f is constant on k; that is, f(x) = f(a) for all x ∈ k