...I used SyBEX for other exams but I don't think it's the best for Bkup & Reco...using it made me postponing my Iz0-025 exam...until I read the pdf docs from Oracle.
A is wrong bcos RMAN can work w/o Catalog
C is wrong bcos RMAN to the best of my knowledge is not compatible with EBU.
D tapesystem is one of the medium that RMAN works with.

I will go with B as suggested by ngdh