请问各位，下面这两个程序中蓝色部分的区别怎么解释呢？非常感谢～

QUESTION 13
A raw data file is listed below:
RANCH,1250,2,1,Sheppard Avenue,"$64,000"
SPLIT,1190,1,1,Rand Street,"$65,850"
CONDO,1400,2,1.5,Market Street,"80,050"
TWOSTORY,1810,4,3,Garris Street,"$107,250"
RANCH,1500,3,3,Kemble Avenue,"$86,650"
SPLIT,1615,4,3,West Drive,"94,450"
SPLIT,1305,3,1.5,Graham Avenue,"$73,650"
The following SAS program is submitted using the raw data file as input:
data work.condo_ranch;
infile'file-specification' dsd;
input style $ @;
if style = 'CONDO' or style = 'RANCH' then
input sqfeet bedrooms baths street $ price : dollar10.;
run;
How many observations does the WORK.CONDO_RANCH data set contain?
A. 0 B. 3 C. 5 D. 7
Answer: D

QUESTION 14
A raw data file is listed below:
RANCH,1250,2,1,Sheppard Avenue,"$64,000"
SPLIT,1190,1,1,Rand Street,"$65,850"
CONDO,1400,2,1.5,Market Street,"80,050"
TWOSTORY,1810,4,3,Garris Street,"$107,250"
RANCH,1500,3,3,Kemble Avenue,"$86,650"
SPLIT,1615,4,3,West Drive,"94,450"
SPLIT,1305,3,1.5,Graham Avenue,"$73,650"
The following SAS program is submitted using the raw data file as input:
data work.condo_ranch;
infile'file-specification' dsd;
input style $ @;
if style = 'CONDO' or style = 'RANCH';
input sqfeet bedrooms baths street $ price : dollar10.;
run;
How many observations will the output data set contain?
A. 0 B. 3 C. 5 D. 7
Answer: B