Suppose We Know the Value Of $\omega$ For a Simple Harmonic Oscillator

Multiple Choice

Suppose we know the value of $\omega$ for a simple harmonic oscillator. What further information do we need to know to fix the amplitude $A$ and the initial phase $\theta$ in the solution to the simple harmonic oscillator equation? (If more than one item is needed, feel free to indicate more than one answer.)

A) The oscillating object's initial position
B) The oscillating object's initial velocity
C) The object's mass
D) The oscillation's period
E) The spring's spring constant
F) We do not need additional information.
G) The oscillating object's initial(position+velocity)