Consider the following data generating process for a series yt:

yt $=\backslash$mu $+1\mathrm{.}5$yt$-1+$ ut

Which one of the following most accurately describes the process for yt$?$

Question $3$ Select one:

a$.$

A random walk with drift

b$.$

A non$-$stationary process

c$.$

A deterministic trend process

d$.$

An explosive process.