What does this accompanying prohibition sign mean?

Is it permissible to park or stop on the right side of the road?

• A

  Permission granted

• B

  Unauthorized

  According to the National Technical Standard on Road Traffic Signs QCVN 41:2019, the "no stopping and parking" sign (symbol P.130) prohibits all types of motor vehicles from stopping and parking on the side of the road where the sign is placed, except for priority vehicles as prescribed. For buses operating on a scheduled route, appropriate stopping locations are indicated.
  Supplementary sign S.503a is placed below the "no stopping and parking" sign to indicate that the sign's direction of effect is to the right.

Japanese

Source: https://vtcnews.vn/bien-bao-cam-kem-bien-phu-nay-co-y-nghia-gi-ar859343.html