State the items from Figure 2 that should be written in place of the labels L1, L2, L3, and L4 in the algorithm shown in Figure 1.

You will not need to use all the items in Figure 2.

• L1:
• L2:
• L3:
• L4:

Figure 1

bookFound ← False
REPEAT
    isbn ← ''
    WHILE isbn = ''
        OUTPUT 'Scan or enter book ISBN: '
        isbn ← L1
    ENDWHILE
    status ← getBookStatus(L2)
    IF status = L3 THEN
        OUTPUT 'L4'
    ELSE
        IF status = 'Available' THEN
            bookFound ← True
        ELSE
            OUTPUT 'Book is currently loaned out.'
        ENDIF
    ENDIF
UNTIL bookFound = True
OUTPUT 'Book issued successfully.'

Figure 2