The security gate at a storage facility requires a four-digit lock code. If the lock code must consist only of digits from 1 through 7, inclusive, with no repeated digits, and the first and last digits of the code must be odd, how many lock codes are possible?  Choose the correct choice from the following choices.
A) 120	B) 240	C) 360	D) 720	E) 1440
X-X-X-X-X --&gt; there are 4 odd digits from 1 to 7, inclusive thus options for the first and the last X's are: 4-X-X-3. Other X's can take following values: 4-5-4-3 --&gt; 4*5*4*3=240.   Answer: 240.
<result>B</result>
The security gate at a storage facility requires a four-digit lock code. If the lock code must consist only of digits from 1 through 7, inclusive, with no repeated digits, and the first and last digits of the code must be odd, how many lock codes are possible?