How to solve

p Forx( ) and y= (. sy.) in R° let d,(x,y for 1Sp 68. and d.r. y) max (b-ylj- 1,2.. Let B,= freR: d, (a, 0) <1), 1 sps Which of the following are comect? Bis open in the d-mctric. B, is not open in the d-metric. B, is openi in the d-metric. B is not open in the dy-rnctric. 2.