A point mass oscillates along the `x-`acis according to the law `x = x_(0)cos(omegat - pi//4)` if the acceleration of the particle is written as, a `= A cos(omega + delta)`, then :
A. `A = x_(0), delta = -pi//4`
B. `A = x_(0)omega^(2), delta = -pi//4`
C. `A = x_(0)omega^(2), delta = -pi//4`
D. `A = x_(0)omega^(2), delta = 3pi//4`