3. 如附圖所示,己知某企業自 2020 年第 2 季起最近 5 期的產品銷售量(單位為百 萬元)為{50, 40, 60, 90, 70},以 R 語言建立 myts 時間序列物件(Time-series Objects),下列敘述哪一項正確?
(A) myts <- ts(c(50,40,60,90,70)) (B) myts <- ts(c(50,40,60,90,70), start = c(2020,2), frequency = 12) (C) myts <- ts(c(50,40,60,90,70), start = c(2020,2), frequency = 4) (D) myts <- ts(c(50,40,60,90,70), start = c(2020,2), frequency = 1)