[多选] Which three statements about end-to-end delay are true？（）

A . End-to-end delay is the sum of propagation delays，processing delays，serialization delays，and queuing delays.
B . Coast-to-coast end-to-end delay over an optical link is about 20 ms.
C . Processing delay depends on various factors，which include CPU speed，CPU utilization，IP switching mode， and router architecture.
D . Propagation and serialization delays are related to the media.
E . Propagation delay is the time it takes to transmit a packet and is measured in bits-per-second （bps）.
F . Serialization delay is the time it takes for a router to take the packet from an input interface and put it into the output queue of the output interface.

Which statement about the Lightweight Access Point Protocol （LWAPP） is true？（） LWAPP encrypts control traffic between the AP and the controller.。 LWAPP encrypts user traffic with a x.509 certificate using AES-CCMP。 LWAPP encrypts both control traffic and user data.。 When set to Layer 3， LWAPP uses a proprietary protocol to communicate with the Cisco Aironet APs.。表型相同不一定代表基因型相同。下列说法正确的是（）本币贬值一定会使国际收支得到改善。本币贬值不一定会使国际收支得到改善。︱Ex+Em︱＞1时，本币贬值会使国际收支得到改善。︱Ex+Em︱=1时，本币贬值会使国际收支得到改善。︱Ex+Em︱＜1时，本币贬值会使国际收支得到改善。公司在工商行政管理部门登记注册的资本即所谓注册资本。（）江南私家园林的装饰利用的是（）装饰被动性。技巧性。智慧性。象征性。 Which three statements about end-to-end delay are true？（）

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[多选] Which three statements about end-to-end delay are true？（）

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