PrestaShop installation - which cache system?

Website Building
#1

Hi,
Trying to install prestashop 1.5.2. In Advanced Parameters > Performance -> Caching, I am asked to select one of the caching system:

Memcached
APC
xcache
File system.

Can you advise which one will work on the 000webhost free account?

#2

Which one is the default? Probably file system, whatever it is it might be best to try that. If they require server side changes then you may struggle on a free host.