No CCA (Copper Clad Aluminum), use all copper.
I HIGHLY suggest to use outdoor-rated cable in underground conduit, because after over 31 years of pulling or replacing cable in buried conduit of all type (RGS, PVC, etc.) at NO time were conductors I pulled out or the bottom of the conduit dry. Some moisture gets into all conduits, oftentimes through the above ground fittings: the earth warms up & cools off as the sun rises and sets; as the earth (and the conduit) cools it draws in air from above-ground fittings and the moisture in the air condenses into water. This heat-cycling causes moisture to collect over time as it never gets hot enough to vaporize, expand and leave the conduit. It collects at the low points and, over time, your conductors are submerged in water 24/7. Conductors that have non-outdoor rated jackets will have water intrusion over time that will affect their performance, whether they be for data or voltage. It may not happen in a month, a year or even 2 or 3 but trust me...it will happen and you'll have down time and will be replacing some conductors after a lot of intermittent issues and troubleshooting.
I know, the jacket of outdoor-rated cable is stiffer and harder to work with above ground but it's easier to pull through conduit than the soft indoor-rated jackets. Do yourself a favor and spend the extra for outdoor-rated cable even in conduit. It's cheaper than you think initially than it would be later.
Me? I use outdoor-rated, shielded CAT-5e (Ubiquiti ToughCable) anytime outdoors, conduit or not, as I live in a VERY active lightning area (NW Alabama) and do my best to mitigate damage from ESD and issues from EMI. You decide for yourself about the shielded. FYI, as a condition of warranty, Ubiquiti requires shielded when their stuff is installed outdoors.