Characterize the following definitions in the above categories. Artificial Intelligence is

a$.$ a collection of algorithms that are computationally tractable, adequate approximations of intractably specified problems. $($Systems that think rationally$)$ ITPU

b$.$ the enterprise of constructing a physical symbol system that can reliably pass the Turing Test. $($Systems that act like humans$)$ HAPU

c$.$ the field of computer science that studies how machines can be made to act intelligently. $($Systems that act rationally$)$ IAPU

d$.$ a field of study that encompasses computational techniques for performing tasks that apparently require intelligence when performed by humans. $($Systems that act like humans$)$ HAPU

e$.$ a very general investigation of the nature of intelligence and the principles and mechanisms required for understanding or replicating it$.($Systems that think rationally$)$ ITTC

f$.$ the getting of computers to do things that seem to be intelligent. $($Systems that act like humans$)$ IAPU

g$.$ the getting of computers to behave like those we see in the movies $($HAL$,$ T$2,$ et al$.).($Systems that act like humans$)$ TT