Sata III or Sata II

I have a WDC WD10JPVX-22JC3T0 on a Acer Aspire V3-772g Laptop.
Is that Sata III or Sata II ?
i want to change it with a SSD and this is a big problem for me.
Please Help me …

That model is a WD Blue 1TB 2 1/2" mobile drive. It is a SATA III, 5400 RPM drive, 9.55mm thick.

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