单选题In a web page with chechboxes you need to write e jquery that retruns the number checked checkboxes.（）Avar n = $（“input：checked”）.length；Bvar n = $（“：input， ：checked”）.length；Cvar n = $（“input：selected”）.length；Dvar n = $（“：input， ：selected”）.length；
单选题
In a web page with chechboxes you need to write e jquery that retruns the number checked checkboxes.（）
A
var n = $（“input：checked”）.length；
B
var n = $（“：input， ：checked”）.length；
C
var n = $（“input：selected”）.length；
D
var n = $（“：input， ：selected”）.length；
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