以下程序的输出结果是( )。(注: └┘ 代表空格) #include ”stdio.h” main() { printf("nstring1=%15s*”, "programming”); printf("nstring2=%-5s*”, "boy”); printf("string3=%2s*”, "girl”); } A. string1=programming └┘└┘└┘└┘ * string2=boy └┘└┘ *string3=gi* B. string1= └┘└┘└┘└┘ programming* string2=boy* string2=boy └┘└┘ *string3=gi* C. string1=programming └┘└┘└┘└┘ * string2=boy └┘└┘ *string3=girl* D. string1=└┘└┘└┘└┘programming* string2=boy└┘└┘*string3=girl*