A21902. 已知文件cj.csv的内容如下图所示，关于cj.csv的操作说法正确的是？（ ）

运行以下程序，将输出：姓名,语文,数学

import csv 
with open('cj.csv') as f:
      rows = list( csv.reader (f))
      print(rows[0])

运行以下程序，将输出：['李2', '55', '98']

import csv 
with open('cj.csv') as f:
      rows = list( csv.reader (f))
      print(rows[2])

运行以下程序，将输出：55

import csv 
with open('cj.csv') as f:
      rows = list( csv.reader (f))
      print(rows[3][2])

运行以下程序，将输出：10

import csv 
with open('cj.csv') as f:
      rows = list( csv.reader (f))
      print(len(rows))