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Theoretical or ideal is the absolute level of capacity without considering normal interruptions in production
Currently attainable standard is less than the ideal standard but is still greater than the normal standard which accounts also the decrease in sales demand. I haven't encountered basic standard so far. And current standard, I assume, you were pertaining to the Master budget standard or the expected actual utilization standard. This is the output actually expected in the next period based on expected demand.
The best answer, in my opinion is D current standard, since normal utilization capacity which is attainable in the long run, is not among the choices. The disadvantage with expected actual utilization standard is that it fluctuates every budget period.