Foundation of Basic Skills Part 2

基本图
After 白1 and 黑2 exchange, option A press becomes inappropriate as it will turn the exchange into damaging for white. Both options B and C are conceptually sound except some minor differences.

图1

After 白1 press, the marked exchange clearly favors black as white approached the corner from the wrong side.

图2
白1 and 白3 speedily form a decent shape although white needs to worry about black invading at C in the future. At this juncture, black will play either A or B.

黑：马晓春 白：常昊 Nov 3, 2007 黑+1.5目
黑：李映九 白：朴时烈 Aug 17, 2009 白+1.5目
图3
When black invades in the future, 图3 variation might be the likely outcome. If white dislikes the potential invasion then white can change strategies with initial R7 approach.
图4
白1 is a probable strategy to pincer farther away to construct a solid shape with 白3. For those players like 李世石 who painstakingly seeks out maximum efficiency, 白1 and 白3 are a bit "soft."
图5
Since
1) white might not get the maximum efficiency right away
2) right lower corner is not urgent to handle at this moment
白1 is another feasible alternative to settle the upper corner first then wait for the opportune moment to play the lower right corner to gain maximum result.

Question:

How should white respond if black pincers with 黑1?