that is all the information. plz help me solve that.

Suppose in an initial-boundary value problem for u(xt), the boundary conditions are as follows: u(0,t) = 0,0 (4, t) = 0, while the initial shape and velocity are given by functions f(x) and g(x) (defined for x (0,4)). Mark all that apply. The function f(x) extended to the whole real line is a periodic function with period 8 The functions f(x) and g(x) extended to the whole real line are odd functions of X The function f(x) extended to the whole real line is not a periodic function f(-x)=f(x) The function f(x) extended to the whole real line is a periodic function with period 4 The functions f(x) and g(x) extended to the whole real line are even functions of f(-x)=-f(x) The function f(x) extended to the whole real line is a periodic function with period 16 NOV 5 W Suppose in an initial-boundary value problem for u(xt), the boundary conditions are as follows: u(0,t) = 0,0 (4, t) = 0, while the initial shape and velocity are given by functions f(x) and g(x) (defined for x (0,4)). Mark all that apply. The function f(x) extended to the whole real line is a periodic function with period 8 The functions f(x) and g(x) extended to the whole real line are odd functions of X The function f(x) extended to the whole real line is not a periodic function f(-x)=f(x) The function f(x) extended to the whole real line is a periodic function with period 4 The functions f(x) and g(x) extended to the whole real line are even functions of f(-x)=-f(x) The function f(x) extended to the whole real line is a periodic function with period 16 NOV 5 W