What is the maximum input voltage for an LDO under specified conditions?

[kschuld]

Homework Statement

Tambient = 85degC, Vout = 1.05V, Iout = 600mA, 3x3 package with thetaJA = 40 deg. Celsius /W, Tjmax = 150 deg. Celsius...What is the max input voltage that the LDO can support while maintaining these conditions?

Homework Equations

The Attempt at a Solution

Answer is one of the following answers
a) 0 b) 3.2v c) 3.6 d)4.2v e) 4.56

 

[NascentOxygen]

So how are you going to go about solving it?