A NAVAREA warning carries the following number; 1986/87 (11). Which statement is TRUE?

A
The warning was issued in 1986, the 87th sequentially numbered warning and broadcast 11 times.
B
This is warning number 1986 issued in 1987, and it affects sub-region 11.
C
This warning is valid in 1986 and 1987 and is the eleventh two-year warning.
D
The subject of this warning first appeared in 1986; this warning is in 1987 and is the eleventh on this topic.
E