单项选择题

Please arrange the three types of robots, SDR, QRIO and SDR4X, according to their production years, from the earliest to the latest.

A．SDR, QRIO, SDR4X.
B．SDR, SDR4X, QRIO.
C．QRIO, SDR, SDR4X.
D．SDR4X, SDR, QRIO.
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