What is the plural of 'spectrum'?

What is the plural of 'spectrum'? Correct Answer Spectra

Spectrum(বর্ণচ্ছটা; বর্ণালি) এর Plural হচ্ছে Spectra এরকম আরো কিছু উদাহরণ হচ্ছে sgendum - agenda/datum - Data/Memorandum Memoranda. অতএব, সঠিক উত্তর (খ)।
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