Provide Solution and choose the letter of the correct answer from the choices below.

1. How many four-letter words beginning and ending with a vowel without any letter repeated can be formed from the word "personnel"?

A.) 40 B.) 480 C.) 20 D.) 312

2. Five different Mathematics books, 4 different electronics books and 2 different communications books are to be placed in a shelf with the books of the same subject together. Find the number of ways in which the books can be placed.

A.) 292 B.) 5760 C.) 34560 D.) 12870