which statements is correct in relation to loan to value ratio $($ltv$)$

the ltv should be greater than $1$ throughout the term of the loan

the ltv should be above $1$ at the beginning of the loan and below $1$ at the end of the loan

the ltv should be less than $1$ throughout the term loan

the ltv should be below $1$ at the beginning of the loan an above $1$ at the end of the loan