请教一道handbook里的问题，望有好心牛人给予解答~
An interest rate cap runs for 12 months basd on 3-month Libor with a strik
e price of 4%. Which of the following is generally ture?
answer: the cap consists of 3 caplet options with maturies of 3 months, the
first one starting today based on 3-month Libor set in advance and paid in a
rrears.
如果真的是3个caplets，按照答案是锁定Max[R(t+3)-4%,K]，那么第一个caplets怎么会是从今天开始呢？
还有关于 call swaption既然叫call不是看涨的意思么，但是照handBook上的解释option to pay floating and receiving fixed，利率上升的时候是亏的呀
