Two simple harmonic motions,as shown,are at right angles. They are combined to form Lissajous figures.
$x(t) = A \sin(at + \delta)$
$y(t) = B \sin(bt)$
Identify the correct match below.

• A
  Parameters: $A = B$,$a = 2b$,$\delta = \frac{\pi}{2}$; Curve: Circle
• B
  Parameters: $A = B$,$a = b$,$\delta = \frac{\pi}{2}$; Curve: Line
• C
  Parameters: $A \neq B$,$a = b$,$\delta = \frac{\pi}{2}$; Curve: Ellipse
• D
  Parameters: $A \neq B$,$a = b$,$\delta = 0$; Curve: Parabola