What is the devolution of catalonia, spain? what r the main issues or reasons related to this region?

(what do they want n why do they want it? are these issues social, cultural, economic, demographic, political, environmental?)

Technician a says the harmonic balancer may be attached to the crankshaft using a woodruff key and center bolt. technician b says the harmonic balancer may be attached to the crankshaft using a square key and center bolt. who is correct? choose one answer. a. technician a b. technician b c. both technician a and technician b d. neither technician a nor technician b