Rioja Aging requirnment

Hi all, I am going to take certified exam under Europe chapter next week. As here we will all received the book sales and service for professional to take the course, I wonder if someone has the same reading difficulty as I do, for Rioja wines.

 text correction received by email:
“ White and rosé Gran Reservas must be matured for four calendar years following the harvest, including a minimum of 12 months in barricas. The barricas are oak and hold 225 litres.”

the Rioja regulation here:

“Gran Reserva Blanco/Rosado: min. 4 years, including at least 6 months in oak (remainder must be in bottle or oak)”

May someone kindly advise it is 6 or 12 months in oak? Thank you very much!